--- product_id: 773995889 title: "Blackt Electrotech (BT31MR) Microwave/Radar Motion Sensor Occupancy Motion Detector for Fall Ceiling | Recessed Mini Motion Sensor Switch (1)" brand: "blackt electrotech" price: "S$2" currency: SGD in_stock: false reviews_count: 3 url: https://www.desertcart.sg/products/773995889-blackt-electrotech-bt31mr-microwave-radar-motion-sensor-occupancy-motion-detector store_origin: SG region: Singapore --- # 40s continuous motion delay 100-240V wide voltage range 360° full coverage detection Blackt Electrotech (BT31MR) Microwave/Radar Motion Sensor Occupancy Motion Detector for Fall Ceiling | Recessed Mini Motion Sensor Switch (1) **Brand:** blackt electrotech **Price:** S$2 **Availability:** ❌ Out of Stock ## Summary > 🚨 Stay ahead of the curve with 360° smart sensing — because your space deserves the best watchful eye! ## Quick Answers - **What is this?** Blackt Electrotech (BT31MR) Microwave/Radar Motion Sensor Occupancy Motion Detector for Fall Ceiling | Recessed Mini Motion Sensor Switch (1) by blackt electrotech - **How much does it cost?** S$2 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/773995889-blackt-electrotech-bt31mr-microwave-radar-motion-sensor-occupancy-motion-detector) ## Best For - blackt electrotech enthusiasts ## Why This Product - Trusted blackt electrotech brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **360° Detection Radius:** Ensures no corner is left unmonitored with full circular coverage ideal for ceiling heights of 3-5 meters. - • **Seamless Motion Sensing:** Keeps lights on with a 40-second delay that resets with every detected movement, eliminating dark moments. - • **Compact & Discreet Design:** Sleek white recessed mini sensor blends seamlessly into fall ceilings, maintaining aesthetic integrity. - • **Energy-Smart Night Operation:** Automatically activates only in low light (7-20 Lux), optimizing energy use without manual intervention. - • **Universal Voltage Compatibility:** Works effortlessly across 100-240V AC, perfect for diverse commercial and residential setups. ## Overview The Blackt Electrotech BT31MR is a compact, recessed ceiling-mounted microwave/radar motion sensor designed for continuous occupancy detection with a 40-second delay. It supports a wide voltage range (100-240V AC), controls loads up to 100 watts, and offers full 360° detection coverage at optimal ceiling heights of 3-5 meters. Its smart night-only activation conserves energy by operating within ambient light levels of 7-20 Lux, making it ideal for residential and commercial security, automation, and energy management. ## Description Full description not available ## Features - Continuous Motion Detection: Features a 40-second delay time, which restarts with each new motion detected, ensuring lights stay on as long as movement is present. Note: (This model not having any LUX & time adjustment) button. - Wide Voltage Compatibility: Operates on AC 100-240V 50/60Hz - Efficient Load Control: It can control up to 100 watt laod - Comprehensive 360° Detection & Optimal Installation Height: Offers complete coverage with a 360° induction angle, perfect for ceiling installations at heights of 3-5 meters. - Smart Day/Night Identification & Ambient Light Sensitivity: Automatically operates only at night, conserving energy, and functions effectively in ambient light levels of 7-20Lux. ## Images ![Blackt Electrotech (BT31MR) Microwave/Radar Motion Sensor Occupancy Motion Detector for Fall Ceiling | Recessed Mini Motion Sensor Switch (1) - Image 1](https://m.media-amazon.com/images/I/611dlrVB+jL.jpg) ![Blackt Electrotech (BT31MR) Microwave/Radar Motion Sensor Occupancy Motion Detector for Fall Ceiling | Recessed Mini Motion Sensor Switch (1) - Image 2](https://m.media-amazon.com/images/I/71N9Ic7fgiL.jpg) ![Blackt Electrotech (BT31MR) Microwave/Radar Motion Sensor Occupancy Motion Detector for Fall Ceiling | Recessed Mini Motion Sensor Switch (1) - Image 3](https://m.media-amazon.com/images/I/71xTlUOZUWL.jpg) ![Blackt Electrotech (BT31MR) Microwave/Radar Motion Sensor Occupancy Motion Detector for Fall Ceiling | Recessed Mini Motion Sensor Switch (1) - Image 4](https://m.media-amazon.com/images/I/81K0JJgwo9L.jpg) ![Blackt Electrotech (BT31MR) Microwave/Radar Motion Sensor Occupancy Motion Detector for Fall Ceiling | Recessed Mini Motion Sensor Switch (1) - Image 5](https://m.media-amazon.com/images/I/717xxnC9hxL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good *by J***S on 16 March 2025* Good ### ⭐ Fake sensor dangerous *by G***H on 23 March 2025* Received a completely fake sensor with a random broken Circuit board with two wires sticking out. I got lucky I checked inside the sensor before installing it. It could have exploded in my hands. ### ⭐⭐⭐⭐⭐ Regarding micro sensor *by G***N on 15 March 2025* Excellent --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/773995889-blackt-electrotech-bt31mr-microwave-radar-motion-sensor-occupancy-motion-detector](https://www.desertcart.sg/products/773995889-blackt-electrotech-bt31mr-microwave-radar-motion-sensor-occupancy-motion-detector) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-05-07*