Shelly BLU Door/Window Outdoor ZB vs Shelly BLU Door/Window ZB

It depends on where it goes. The Shelly BLU Door/Window Outdoor ZB is IP55 rated and handles gates, sheds and exterior entrances while still working indoors. The Shelly BLU Door/Window ZB is indoor only but adds an ambient light sensor, so it is the better choice for a room where brightness should trigger an automation.

Sealing against sensing. The Shelly BLU Door/Window Outdoor ZB trades the indoor model's light sensor for an IP55 shell and a -20 to 40 degrees Celsius range. The Shelly BLU Door/Window ZB keeps the light sensor but is rated for indoor use only.

Yes, in one form or another. Both are Zigbee 3.0 end devices that join an existing coordinator, and both also broadcast Bluetooth 5 LE in the BTHome format to a Shelly gateway. The Shelly Smart Control app, and Google Home, Alexa and SmartThings behind it, see either sensor only once a Shelly gateway is on the network.

No. It is indoor only and Shelly publishes no IP rating for it, with its safety guide restricting the device to indoor use. For a gate, a shed or an exterior entrance, the Shelly BLU Door/Window Outdoor ZB is the model that carries an IP55 enclosure and the wider temperature range.

Yes. Both the Shelly BLU Door/Window Outdoor ZB and the Shelly BLU Door/Window ZB measure the inclination angle, so a controller can tell closed, tilted and fully open apart rather than treating every opening the same. The indoor model additionally documents a configurable angle threshold.

A Zigbee household that needs contact and tilt monitoring on a gate, a shed, a garage side entrance or an exterior window, or that prefers one sealed sensor covering every opening in the home.

A Zigbee household monitoring indoor windows and doors that also wants a light reading for brightness-based automations, on the smaller, lighter sensor that hides easily on a narrow frame.