Ring Window and Door Contact Sensor (2nd gen) vs Sonoff SenseGuard DW Gen2

Sonoff SenseGuard DW Gen2, because it works with Alexa, Google Home, SmartThings, Home Assistant and IFTTT and logs 90 days of history with tamper and low-battery alerts. Ring Window and Door Contact Sensor (2nd gen) wins on price and is the better received, but it only works with a Ring Alarm base station.

No. Ring Window and Door Contact Sensor (2nd gen) is a Z-Wave device that requires a Ring Alarm base station, and event history needs a Ring Protect subscription. Sonoff SenseGuard DW Gen2 needs a Zigbee hub, but that can be Home Assistant, SmartThings or any standard coordinator, with no subscription.

Ring Window and Door Contact Sensor (2nd gen), at 53 x 28 x 14 mm, noticeably slimmer than the 90 x 26 x 13.5 mm Sonoff SenseGuard DW Gen2, which is longer because it holds two AAA batteries rather than coin cells.

Yes. Ring Window and Door Contact Sensor (2nd gen) includes tamper detection and its newest revision adds a screw-down battery cover. Sonoff SenseGuard DW Gen2 also has a tamper alert, plus low-battery warnings and 90 days of history stored for review.

Ring Window and Door Contact Sensor (2nd gen) runs about three years on two CR2032 coin cells. Sonoff SenseGuard DW Gen2 is rated for about three years on two AAA cells, which cost less and are easier to find, at the price of a bulkier body.

Anyone with a Ring Alarm base station who wants slim, cheap, reliable sensors on several windows and doors, with tamper detection and easy peel-and-stick mounting. If you want platform-agnostic automation and on-device history, Sonoff SenseGuard DW Gen2 is the better fit.