Heiman Window Door Alarm vs Sonoff SenseGuard DW Gen2

Sonoff SenseGuard DW Gen2, for reliability and features: tamper alerts, low-battery warnings, 90 days of history, three year AAA batteries and support for Alexa, Google Home, SmartThings, Home Assistant and IFTTT. Heiman Window Door Alarm wins on price and needs no hub, connecting straight to Wi-Fi.

Sonoff SenseGuard DW Gen2 does, since it is a Zigbee device with no Wi-Fi or Bluetooth fallback. Heiman Window Door Alarm connects directly to 2.4 GHz Wi-Fi through the Smart Life (Tuya) app with no gateway and no subscription for basic alerts.

Heiman Window Door Alarm has a 65 dB audible alarm built into the sensor alongside app alerts, so it can startle an intruder locally. Sonoff SenseGuard DW Gen2 has no siren and relies entirely on your hub to raise an alarm or run an automation.

Sonoff SenseGuard DW Gen2 runs about three years on two AAA cells and reports tamper and low-battery events with 90 days of history. Heiman Window Door Alarm runs about a year on a replaceable CR2, and its Smart Life app cannot customise the alert sound or vibration.

Sonoff SenseGuard DW Gen2, which owners describe as pairing near-instantly and reporting dependably through Home Assistant. Heiman Window Door Alarm is hit or miss, with a couple-second delay on open and close and a minority of units that stop notifying or will not reconnect after an outage.

Buyers who want the cheapest hub-free sensor with a built-in siren, are happy inside the Smart Life app and only need Alexa or Google Assistant. If you run Home Assistant or any Zigbee hub and want tamper alerts and long battery life, Sonoff SenseGuard DW Gen2 is the better sensor.