Without a suitable hub a sensor stays mute. The SONOFF SNZB series and the Gosund ST19 speak ZigBee and need a gateway, while the Tapo ones pair with a TP-Link hub — only then do alerts start reaching the phone. The range covers temperature and humidity, door and window opening, motion, human presence and water leaks; the last of these comes with a separate wired probe (WLDC200) that can be run to the floor of the boiler cupboard. A battery is usually included in the box.
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Without a suitable hub a sensor stays mute. The SONOFF SNZB series and the Gosund ST19 speak ZigBee and need a gateway, while the Tapo ones pair with a TP-Link hub — only then do alerts start reaching the phone. The range covers temperature and humidity, door and window opening, motion, human presence and water leaks; the last of these comes with a separate wired probe (WLDC200) that can be run to the floor of the boiler cupboard. A battery is usually included in the box.