Drip & Leak Alert - Responds to drips and leaks with 6 detection probes on both top and bottom. Up to 90dB Alarm - Get alerted with its 90 dB siren and mute the alarm with one-touch. IP67 Waterproof Rating - IP67 waterproofing protects from wet and dusty environments. Instant App Notification - Receive instant alerts via the Tapo app when a leak occurs from anywhere. Flexible Placement - Wireless, designed to place in anywhere leaks or flooding may occur, like under the sinks, near washing machine, bathtub and more. Visible Alarm with Tapo Lights - Get a visual alert from your smart bulb before disaster strikes. Hub Required (Sold separately)- Triggers the Hub alarm when leakage is detected. Manage up to 64 sensors with one hub. Tapo Hub Functions: With the Tapo Hub as a bridge, the Tapo Smart Sensor works with a wide range of Tapo devices; Easily control and monitor your home from anywhere This device operates exclusively within the specified Sub-1G band; Please note that different regions support different frequency bands; Ensure that the devices or hubs you intend to use are compatible with the same Sub-1G band