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 6 �A
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 SHT40 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
 
Encryption Key:48656C6C6F204254486F6D65210D0A00
 
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
< 6 �A
Broadcast Interval
1 minute
Battery Life
Approx. 1-2 years
Sensor Dimensions
72 � 26 � 19 mm
Magnet Dimensions
40 � 15 � 15 mm
Mounting Method
3M adhesive
Material
Flame-retardant ABS, matte white finish
 

Product Highlights
BTHome Door Contact Sensor with Temperature and Humidity is a BTHome Bluetooth sensor for door/window status, temperature, and humidity monitoring in Home Assistant. It is designed for local smart home automation without requiring Wi-Fi or cloud control.
Ideal For
Door and window open/close detection
Room temperature and humidity monitoring
Home Assistant automations using BTHome Bluetooth data
Compatibility
Designed for local smart home use with BTHome Bluetooth data and Home Assistant. A compatible Bluetooth adapter, built-in Bluetooth, or ESPHome Bluetooth Proxy may be required depending on your Home Assistant setup.