Aqara Door and Window Sensor vs Sonoff SenseGuard DW Gen2

Sonoff SenseGuard DW Gen2, on battery life (three years on AAA cells), tamper and low-battery alerts, 90 days of history and standard Zigbee behaviour. Aqara Door and Window Sensor wins on price and integrations, adding Apple HomeKit, IFTTT and Matter through an Aqara hub.

Aqara Door and Window Sensor, by a wide margin: at 41 x 22 x 11 mm it is roughly a quarter the size of typical sensors and barely noticeable on a white door. Sonoff SenseGuard DW Gen2 measures 90 x 26 x 13.5 mm because it houses two AAA batteries, so it stands out on a frame.

Only Aqara Door and Window Sensor, which reaches Apple HomeKit and Matter through an Aqara hub, along with Alexa, Google Home, IFTTT and Home Assistant. Sonoff SenseGuard DW Gen2 covers Alexa, Google Home, SmartThings, Home Assistant and IFTTT, with no HomeKit and no Matter.

Sonoff SenseGuard DW Gen2 runs about three years on two standard AAA cells that cost almost nothing to replace. Aqara Door and Window Sensor uses a CR1632 coin cell rated for two years, which owners often find lasts one to two years in practice while keeping the sensor tiny.

Sonoff SenseGuard DW Gen2, which behaves as a standard Zigbee device and pairs cleanly through Zigbee2MQTT or ZHA. Aqara Door and Window Sensor uses a partial Zigbee implementation that is well documented to lock up on mixed ZHA networks with third-party repeaters, so it is happiest on an Aqara hub.

Apple Home households and anyone who wants the smallest, least visible sensor at the lowest price, on an Aqara hub or Zigbee2MQTT. If you want tamper alerts, replaceable AAA power and predictable standard-Zigbee behaviour, Sonoff SenseGuard DW Gen2 is the better fit.