The water leak sensor detects moisture using two metal contacts on the end of a 91cm wire connected to the sensor. Place the water leak sensor in areas like bathrooms, basements, or cabinets contacts can easily detect a pool of water forming, runs off two aaa batteries not included. When a leak is detected it will send a notification to your phone as well as triggering an audible alarm transmission frequency 2.40000000ghz transmission standard wifi dustparticle ingress protection 6 - dust tight, no ingress of dust liquidmoisture ingress protection 7 - immersion up to 1m operating temperature -20.000000c, 60.00000000c length 74.00000000mm width 64.00000000mm depth 23.00000000mm cable length 910.00000000mm size shape aaa type alkaline battery quantity 2.00000000pc batteries included false batteries can be replaced by user true siren volume 60.00000000db