This is a smart door and window contact sensor that supports the BTHome protocol, and also measures temperature and humidity.
It reports real-time open/close status via Bluetooth Low Energy (BLE) and can be automatically recognized by Home Assistant through an ESPHome Bluetooth Proxy.Built with an ultra-low-power BLE chipset and a high-sensitivity reed switch, it runs for over 1 year on just two AAA batteries (batteries not included).
Make your home safer and smarter with effortless installation and reliable performance.
Native BTHome Protocol Support
Based on the open-source BTHome v2 standard
Supports encrypted broadcasting for enhanced privacy
Plug-and-play — automatically detected by Home Assistant
Ultra-Low Power Design
BLE 5.0 technology with broadcast current of only a few milliamps
Deep sleep current as low as 7 µA
Runs 1–2 years on two AAA batteries
Reliable Magnetic Detection
Fast response, open/close detection latency < 100 ms
Strong anti-interference performance, works with all door materials
Temperature & Humidity Sensing
Built-in digital sensor reports accurate ambient conditions
View real-time readings in Home Assistant dashboards
Ideal for climate monitoring in rooms, cabinets, or storage areas
Easy Installation
Pre-applied 3M adhesive for quick mounting
Ideal for doors, windows, drawers, mailboxes, and cabinets
Ideal Use Cases
Home security monitoring for doors and windows
Smart lighting automation (e.g., lights on when door opens)
Refrigerator or freezer door alerts
Office or storage cabinet tracking
Environmental monitoring for temperature and humidity
It is strongly recommended to use an ESPHome Bluetooth Proxy with Ethernet for best stability.
Add the following configuration in your ESPHome setup:
esp32_ble_tracker:
scan_parameters:
interval: 320ms
window: 320ms
active: true
bluetooth_proxy:
active: true
| Wireless Protocol | Bluetooth Low Energy (BLE 5.0) |
| Protocol Standard | BTHome v2 (encrypted) |
| Transmission Type | BLE broadcast |
| Detection Method | Magnetic reed switch |
| Response Time | < 100 ms |
| Temperature Range | –40 °C ~ +60 °C |
| Power Supply | 2 × AAA batteries (not included) |
| Standby Current | < 7 µA |
| Broadcast Interval | 1 minute |
| Battery Life | Approx. 1–2 years |
| Sensor Dimensions | 71.5 × 25.3 × 19.3 mm |
| Magnet Dimensions | 39.5 × 14.8 × 14.9 mm |
| Mounting Method | 3M adhesive |
| Material | Flame-retardant ABS, matte white finish |