---
product_id: 278517579
title: "Sonoff S31"
brand: "sonoff"
price: "S$50"
currency: SGD
in_stock: null
reviews_count: 12
url: https://www.desertcart.sg/products/278517579-sonoff-s31
store_origin: SG
region: Singapore
---

# 15A max current 100 days power usage data 2.4 GHz WiFi connectivity Sonoff S31

**Brand:** sonoff
**Price:** S$50
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Power your smart life with precision and ease!

## Quick Answers

- **What is this?** Sonoff S31 by sonoff
- **How much does it cost?** S$50 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/278517579-sonoff-s31)

## Best For

- sonoff enthusiasts

## Why This Product

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

## Key Features

- • **Effortless Smart Setup:** Plug in, pair via eWeLink app, and control your home in minutes.
- • **Custom Scheduling & Timers:** Automate your devices to fit your lifestyle and never miss a beat.
- • **Precision Power Monitoring:** Track real-time voltage, current, and power consumption with detailed 100-day reports.
- • **Voice-Activated Convenience:** Seamlessly integrates with Alexa & Google Home for hands-free control.
- • **Certified Safety & Reliability:** ETL/FCC/RoHS certified for peace of mind in every smart connection.

## Overview

The Sonoff S31 is a compact, ETL/FCC/RoHS certified smart plug supporting 15A and 1800W max load, designed for 2.4 GHz WiFi networks. It offers seamless app and voice control, advanced power consumption monitoring with 100 days of data storage, and customizable scheduling, making it an essential upgrade for any modern smart home setup.

## Description

Product Description SONOFF S31 WiFi Smart Plug - Enjoy your smart home life. App Download : Search on App store, eWeLink, or Scan the Qr code on the User Manual and install it. Easy to Set Up - Works with App Step 1: Download eWeLink App; Step 2: Plug the Smart Wi-Fi Plug into any outlet; Step 3: Configure Smart Wi-Fi Plug preferences on eWeLink App. Power Consumption Monitoring Keep track of real-time power, current and voltage of your appliances and reports on eWeLink APP. Overload Protection Set threshold value including power, current and voltage to ensure devices work securely. Certified Safe ETL/FCC/RoHS certificated – Secure and guaranteed SONOFF S31 WiFi Smart Plug works with your existing home Wi-Fi (2.4 GHz band) Technical Specifications Model Number: S31 WiFi Requirement: 2.4Ghz Only Rated Voltage: 120V Rated Current: 15A Max Ac Frequency: 2.4 Ghz Max power: 1800W Note: The maximum power changed as the local voltage.

Review: worth it re-programmed with ESPHome or not - Can be configured for ESPHome/HomeAssistant. Works great! I use it to monitor power usage to trigger "running" and "done" type notifications for my not-smart laundry and dishwasher, where i disabled the button and set the led to match the running state. Why this instead of zigbee? because the highish sample rate power number stream isn't so great for blasting through a zigbee network, that might have hops through battery powered devices. it's good to keep zigbee more event based rather than stream based, for latency and power saving.
Review: Good for flashing to ESPHome - This is a great power monitoring smart plug if you are willing to flash ESPHome to "uncloud" it. This turns it into a locally controlled device that does not "call home" or require proprietary apps to function. Easy to take apart and reassemble after modding. Fixes many of the pain points described by other reviewers (poor WiFi, app pairing issues). Otherwise for the sake of privacy you are better off with a Zigbee model like the S31 Lite.

## Features

- Simple Setup and Use: plug in, open eWeLink APP, click the "+" in the upper right corner to pairing, and get started in minutes.
- Voice Control – Works with desertcart Alexa and Google Home to start a voice-controlled home.
- APP Remote Control: Manage electronic devices from anywhere.
- Set Schedule or Timer: Create schedules to turn plugs on and off at specific times.User will control their decoration lights via timer functions.
- Power Consumption Monitoring: Keep track of real-time power, current and voltage of your appliances and reports on APP; Store 100 days of electricity usage data and total electricity cost.
- Secure and Guaranteed: ETL/FCC/RoHS certificated.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08TNF4835 |
| Amperage | 15 Amps |
| Batteries Required? | No |
| Best Sellers Rank | #270,010 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #379 in Electrical Outlet Switches |
| Connector Type | Plug in |
| Customer Reviews | 4.2 4.2 out of 5 stars (463) |
| Date First Available | January 21, 2021 |
| Included Components | 15A Smart Outlet Socket ETL Certified, Work with Alexa & Google Home |
| Item Package Quantity | 1 |
| Item Weight | 3.2 ounces |
| Item model number | S31 |
| Manufacturer | SONOFF |
| No. of wires | 3 |
| Number Of Pieces | 1 |
| Number Of Poles | 3 |
| Part Number | S31 |
| Plug Format | Type B |
| Product Dimensions | 3 x 1.57 x 1.3 inches |
| Specification Met | Etl, Fcc, Rohs |
| Style | S31 |
| Warranty Description | 1 Year Warranty. |
| Wattage | 1800 watts |

## Product Details

- **Brand:** SONOFF
- **Color:** White
- **Material:** Polycarbonate (PC)
- **Product Dimensions:** 1.57"D x 3"W x 1.3"H
- **Voltage:** 120 Volts (AC)

## Images

![Sonoff S31 - Image 1](https://m.media-amazon.com/images/I/210WZX-gxGL.jpg)
![Sonoff S31 - Image 2](https://m.media-amazon.com/images/I/21VlJ-KLI5L.jpg)
![Sonoff S31 - Image 3](https://m.media-amazon.com/images/I/3195ke8cHJL.jpg)
![Sonoff S31 - Image 4](https://m.media-amazon.com/images/I/417QSb38+hL.jpg)
![Sonoff S31 - Image 5](https://m.media-amazon.com/images/I/41L6Oy6VLpL.jpg)

## Questions & Answers

**Q: Estos plugs vienen en su caja original?**
A: SI estos plugs vienen en su caja original

**Q: Does this resume a timer schedule after a power failure?**
A: Yes it can resume a set power state and keeps it's custom timer settings.

**Q: Can this send me a notification if the energy or power reaches below or above a certain level?**
A: Yes. I flash all my s31s with ESPHome so i can use them with Home Assistant (you can use them with HA without flashing them, but they dont work reliably w/ the stock cloud-connected software, at least not reliably enough for switching power on/off). I then use Node Red in HA to read the power consumption in watts and send me a message via Telegram if a condition is met. Works great to remind me to turn off my home entertainment equipment before bed. Also works to alert me when the washing machine is done.

**Q: Does this resume a timer schedule after a power failure?**
A: Yes, because the timer program is based on cell phone app. The sonoff is just a wifi relay commanded by app.

## Customer Reviews

### ⭐⭐⭐⭐⭐ worth it re-programmed with ESPHome or not
*by B***I on December 31, 2025*

Can be configured for ESPHome/HomeAssistant. Works great! I use it to monitor power usage to trigger "running" and "done" type notifications for my not-smart laundry and dishwasher, where i disabled the button and set the led to match the running state. Why this instead of zigbee? because the highish sample rate power number stream isn't so great for blasting through a zigbee network, that might have hops through battery powered devices. it's good to keep zigbee more event based rather than stream based, for latency and power saving.

### ⭐⭐⭐⭐⭐ Good for flashing to ESPHome
*by D***K on June 5, 2025*

This is a great power monitoring smart plug if you are willing to flash ESPHome to "uncloud" it. This turns it into a locally controlled device that does not "call home" or require proprietary apps to function. Easy to take apart and reassemble after modding. Fixes many of the pain points described by other reviewers (poor WiFi, app pairing issues). Otherwise for the sake of privacy you are better off with a Zigbee model like the S31 Lite.

### ⭐⭐⭐⭐⭐ Installed customer firmware, most feature rich outlet for the price
*by T***M on November 5, 2025*

I installed custom firmware in each of these. Love these specific models because they offer great value for the price - you can monitor power usage and control outlets. They're seemingly durable and offer great features.

## Frequently Bought Together

- SONOFF S31 WiFi Smart Plug with Energy Monitoring, 15A Smart Outlet Timer Switch ETL Certified, Compatible with Alexa & Google Home, IFTTT Supporting, 2.4 Ghz Wi-Fi Only
- Goupchn Test Hooks to Breadboard Female Jumper Wires Soft Flexible Silicone Test Leads for Electrical Testing
- HiLetgo CP2102 USB 2.0 to TTL Module Serial Converter Adapter Module USB to TTL Downloader with Jumper Wires

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-02-07*