---
product_id: 1259687
title: "T31 Coded Chest Transmitter and Elastic Strap"
brand: "polar"
price: "S$95"
currency: SGD
in_stock: true
reviews_count: 8
category: "Polar"
url: https://www.desertcart.sg/products/1259687-t31-coded-chest-transmitter-and-elastic-strap
store_origin: SG
region: Singapore
---

# 2500 hours battery life Water-resistant & sweat-proof 5kHz coded transmission T31 Coded Chest Transmitter and Elastic Strap

**Brand:** polar
**Price:** S$95
**Availability:** ✅ In Stock

## Summary

> 💓 Stay in sync, stay ahead — your heart’s ultimate training partner.

## Quick Answers

- **What is this?** T31 Coded Chest Transmitter and Elastic Strap by polar
- **How much does it cost?** S$95 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/1259687-t31-coded-chest-transmitter-and-elastic-strap)

## Best For

- polar enthusiasts

## Why This Product

- Trusted polar brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Sweat & Splash Proof:** Slim, lightweight, and waterproof design built for intense workouts.
- • **Endurance-Ready Battery:** Up to 2500 hours of reliable use—train without interruptions.
- • **Comfort-Fit Elastic Strap:** Adjusts to chest sizes 25-54 inches for a snug, secure fit all session long.
- • **Precision Heart Rate Sync:** Coded 5kHz signal eliminates cross-talk for ultra-accurate data.
- • **Universal Gym Compatibility:** Seamlessly pairs with Polar monitors & major gym equipment for effortless tracking.

## Overview

The Polar T31 Coded Chest Transmitter with elastic strap delivers precise heart rate data via a 5kHz coded signal that prevents interference from nearby devices. Designed for durability and comfort, it features a slim, waterproof build and a long-lasting 2500-hour battery life. Compatible with a wide range of Polar heart rate monitors and gym equipment, it ensures seamless integration for professional-grade fitness tracking.

## Description

desertcart.com Slim, lightweight, and water-resistant, the Polar T31 coded transmitter and belt set accurately transmits your heart rate data to your Polar wrist-top computer. As a result, it's easy to monitor your heart rate during training runs. This version of the T31 coded, meaning it prevents crosstalk from other electronic devices to ensure complete accuracy (Polar also sells a non-coded T31). It's also built to last, with a design that holds up to 2,500 hours of training usage. The transmitter belt--which works with all current Polar wrist-top computers except the CS600 and RS800--includes a sealed transmitter and elastic strap. About Polar The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of "intensity training" by heart rate swept the athletic world in the eighties. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals. Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart rate based exercise.Getting Started Getting started with your T31 Coded Transmitter is easy. For best results, thoroughly moisten the back electrode areas of the transmitter with water and adjust the strap length to fit snug, but comfortable. Check that the moist electrode areas are firmly against your skin and that the Polar logo is in the upright position. Tip: When you are finished with your workout, remove the transmitter, rinse with water and dry with a soft towel. Never store the transmitter wet, in a damp environment or in any kind of non-breathable material, such as a plastic bag or sports bag. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. This will shorten the battery life. Keep in a cool and dry place. Tip: When you are finished with your workout, remove the transmitter, rinse with water and dry with a soft towel. Never store the transmitter wet, in a damp environment or in any kind of non-breathable material, such as a plastic bag or sports bag. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. This will shorten the battery life. Keep in a cool and dry place. Product Description Slim, light and fully water resistant transmitter that prevents cross-talk from other electrical devices for accurate measurement.

Review: Reliable and inexpensive alternative - I have purchased the Polar T31Coded Transmitter and Belt Set from desertcart as a replacement for my old transmitter and belt. Before bying this set, I have considered replacing just the battery itself but the cost and headache for doing it were both not worth it. Also, there was nothing even close in the price range at the Dick's Sporting Goods that I could find as these parts are not being sold by the stores. I have to say that I am NOT using the original wrist watch that came with this set due to the fact that all of the Precor aerobic machines in our gym support this set by directly reading the heart rate from the belt transmitter and displaying it on the console. It is a much better and more convinient option for me not to have to check the wrist watch and play with it so the compatibility with other exercise equipment is something I care about a lot. This product is very reliable as it took over 12 years for a battery to wear-out before I had to replace it. I am strongly recommending this product based on its longevity, durability, quality, compatibility with other equipment, and price affortibility.
Review: 2 year battery life BUT read the whole review - I bought this "NEW" in June of 2016. In July 2018 it started not broadcasting my heart rate for about the first 20 minutes every workout until it gets warm and a little sweaty, then it starts working, slowly coming down from 220 indicated BPM or so to what my actual heart rate is. (my heart doesn't go 220-bpm) There are 25 spinning bikes in the room, it does the same thing ON ALL 25 BIKES, EVERY SINGLE BIKE SAME THING, so it is not the heart rate indicator on "THE BIKE"! I have used Polar HRMs since the 1990s maybe 1980s? Within the last 5 or 10 years or so the battery life has gotten shorter and shorter. Maybe mine sat on the shelf in some department store or in some bike shop for the first 5 or 10 years of its life before I bought it "NEW" from desertcart? I honestly don't know what to do. I have to buy another one because all the equipment i use at the health club (where i work) is Polar compatible. Maybe the non-coded one is cheaper and will last longer, we will see. This is a follow up, March 2019. I tried an experiment for the last month or two. I run the transmitter under water in the sink at the health club for a second or 2, just to make it wet. I put it on wet and i go into the spinning room and it works perfectly the second i turn on the heart rate indicator on the bike. All the way through the workout it works perfectly. SO if you have one that stopped working or works intermittently, run it under water and put it on to see if that makes it work. Maybe it is an indicator that the battery is getting low but this saved me from buying a new one at this time. Good luck!

## Features

- Transmits heart rate data to Polar heart rate monitors using 5kHz transmission and compatible gym equipment. Compatible heart rate monitors include, but are not limited to: FT1, FT2, FT4, FT7, FT40, FT60, FT80, RS100, RS300X, RS400, RCX5
- Compatible products:Elastic straps.Individually coded to pick up your heart rate monitor and not others nearby. This eliminates cross-talk with other electronic devices in the same area.
- Slim, lightweight, and waterproof design
- Fits 25 to 54 inch chest size
- Average battery lifetime is 2500 hours of use. Non user replaceable battery

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000ARDPPU |
| Battery Average Life | 2500 Hours |
| Battery Description | Lithium-Ion |
| Best Sellers Rank | #46,531 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #323 in Electronics & Gadgets |
| Brand | POLAR |
| Brand Name | POLAR |
| Color | Black |
| Compatible Devices | Polar FT2 |
| Customer Reviews | 4.1 out of 5 stars 2,861 Reviews |
| Display Size | 54 Inches |
| EU Spare Part Availability Duration | 1 Years |
| Global Trade Identification Number | 00725882017594, 00725882201351 |
| Included Components | Heart Rate Transmitter |
| Item Dimensions L x W x H | 0.04"L x 0.04"W x 0.04"H |
| Item Type Name | Coded Heart Rate Transmitter and Belt Set |
| Item Weight | 0.09 Kilograms |
| Manufacturer | Polar |
| Material | Elasticized-Fabric |
| Material Type | Elasticized-Fabric |
| Model Number | 92053125 |
| Product Dimensions | 0.04"L x 0.04"W x 0.04"H |
| Screen Size | 54 Inches |
| Sensor Type | ECG |
| Team Name | Polar |
| UPC | 725882017594 |
| Unit Count | 1.00 Count |
| Warranty Description | 2 year manufacturer |

## Product Details

- **Battery Description:** Lithium-Ion
- **Battery Life:** 2500 Hours
- **Brand:** POLAR
- **Color:** Black
- **Compatible Devices:** Polar FT2
- **Item Weight:** 0.09 Kilograms
- **Material:** Elasticized-Fabric
- **Product Dimensions:** 0.04"L x 0.04"W x 0.04"H
- **Screen Size:** 54 Inches
- **Sensor Type:** ECG

## Images

![T31 Coded Chest Transmitter and Elastic Strap - Image 1](https://m.media-amazon.com/images/I/614acgZzr8L.jpg)

## Questions & Answers

**Q: How do you change the battery?**
A: Although the unit is designed NOT to have the battery replaced, it can be done.  It takes a CR2032 coin type battery.I followed this video and successfully replaced mine in under ten minutes.https://youtu.be/lBsv9XoV6aA

**Q: Is it compatible  with a life fitness treadmill? If so how can it be connected?**
A: Yes it is compatible, actually I purchased for same treadmill brand . It is conected automatically by gymlink so no setup is required.  Great product .

**Q: how do you pair this t31 with compatible treadmill machines with polar sign on it?**
A: Pairing is automatic.  Just start your workout and it will sync with a little sweat

**Q: Does the t31 work with the iphone 5? I've tried without success using both MapMyRide and the Polar App. Cheers M**
A: The problem is that you need the device to be capable of acquiring data from the transmiter in it's own frequency and I do not think that the iphone is able to do that without a special additional device. For example you have a app called sports tracker that has its own heart rate monitor, I do not know how it works gut there must be some way to catch the information from the heart rate monitor to the phone. For what I know is very probable that you should need some additional device to get the heart rate monitor frequency.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Reliable and inexpensive alternative
*by S***R on September 14, 2011*

I have purchased the Polar T31Coded Transmitter and Belt Set from Amazon as a replacement for my old transmitter and belt. Before bying this set, I have considered replacing just the battery itself but the cost and headache for doing it were both not worth it. Also, there was nothing even close in the price range at the Dick's Sporting Goods that I could find as these parts are not being sold by the stores. I have to say that I am NOT using the original wrist watch that came with this set due to the fact that all of the Precor aerobic machines in our gym support this set by directly reading the heart rate from the belt transmitter and displaying it on the console. It is a much better and more convinient option for me not to have to check the wrist watch and play with it so the compatibility with other exercise equipment is something I care about a lot. This product is very reliable as it took over 12 years for a battery to wear-out before I had to replace it. I am strongly recommending this product based on its longevity, durability, quality, compatibility with other equipment, and price affortibility.

### ⭐⭐⭐⭐⭐ 2 year battery life BUT read the whole review
*by A***R on December 27, 2018*

I bought this "NEW" in June of 2016. In July 2018 it started not broadcasting my heart rate for about the first 20 minutes every workout until it gets warm and a little sweaty, then it starts working, slowly coming down from 220 indicated BPM or so to what my actual heart rate is. (my heart doesn't go 220-bpm) There are 25 spinning bikes in the room, it does the same thing ON ALL 25 BIKES, EVERY SINGLE BIKE SAME THING, so it is not the heart rate indicator on "THE BIKE"! I have used Polar HRMs since the 1990s maybe 1980s? Within the last 5 or 10 years or so the battery life has gotten shorter and shorter. Maybe mine sat on the shelf in some department store or in some bike shop for the first 5 or 10 years of its life before I bought it "NEW" from Amazon? I honestly don't know what to do. I have to buy another one because all the equipment i use at the health club (where i work) is Polar compatible. Maybe the non-coded one is cheaper and will last longer, we will see. This is a follow up, March 2019. I tried an experiment for the last month or two. I run the transmitter under water in the sink at the health club for a second or 2, just to make it wet. I put it on wet and i go into the spinning room and it works perfectly the second i turn on the heart rate indicator on the bike. All the way through the workout it works perfectly. SO if you have one that stopped working or works intermittently, run it under water and put it on to see if that makes it work. Maybe it is an indicator that the battery is getting low but this saved me from buying a new one at this time. Good luck!

### ⭐ Great for a week, now it's garbage
*by C***X on March 11, 2013*

I've been using this strap at the gym with a LifeFitness elliptical and treadmill. When I first used it, it was excellent. I just hopped on the elliptical and started the workout and the strap automatically kicked in and sent information to the machine. I didn't even have to sweat a whole lot. Same thing with the treadmill. Throughout my roughly 1 hour workouts for about 1 week, it worked perfectly. A few days ago though I started noticing problems with the heart rate reading on the machine. From the usual 158-165 BPM I try to stick to, it all of a sudden goes to like..130 or 140 or even 120 out of nowhere. Since the machines I'm using are basing the strain of the exercise on my inputted target heart rate (160), when there's a sudden drop like that, the whole workout gets all screwed up (the resistance on the elliptical skyrockets, or the incline on the treadmill). Sometimes the reading just flat out shuts off and the machine tells me it needs my heart rate. I'm pretty sure I've ruled out the possibility of interference, as for that first week when the strap was working just fine, there were sometimes people right next to me with a polar wrist strap on. No interference. On top of that, it's happening when I'm at least 5 machines away from anyone else. Also, I don't think the problem is with the battery either. Before I made my purchase, I read that the sensors are very sensitive to wetness. Everytime I'm done with the strap, I take it off and dry it well, then place it in a dry area until the next day. Lastly, if it were a problem with the machine itself then why is it happening on multiple machines, of two different kinds? I'm compelled to believe that it's a faulty product.

## Frequently Bought Together

- Polar T31 Coded Chest Transmitter and Elastic Strap
- Polar H9 Heart Rate Sensor
- hengkang Fit for Polar FT4/FT7 Watch Bands, Stylish Adjustable Silicone Replacement Band Straps Wristbands Accessory Band Bracelet

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-01*