NOTES: Aqara Hub is required and sold separately. Requires a secured 2. 4 gigahertz WiFi network connection. One Aqara Hub can connect up to 32 Aqara devices. FLOOD DETECTION: Whenever the Aqara Water Leak Sensor detects water, it can send an alert to your phone and activate the local alarm on the Aqara Hub to prevent leaks and flooding. HOME AUTOMATION: Controls and triggers Aqara connected devices when excess water is detected. WIRELESS & SENSITIVE: No wiring or screws are required. The ultra mini design allows you to put it anywhere that dripping and leaking could happen. Our water leak sensor is designed with sensitive leak probes which the threshold of the water level is 0.5mm. INDUSTRY-LEADING QUALITY: Durable IP67 water-proof housing with rust-proof exterior coating. Zigbee2MQTT and comparable third-party USB dongles are not officially supported by Aqara. Full product functionality may be limited or unavailable., Weight: 0.04 Pounds, Manufacturer: Lumi United Technology Co., Ltd