Features: Door magnet is a safety alarm device used to detect whether doors, windows, drawers, etc. have been illegally opened or moved. When you leave home, it will push notification message to you when the door/window opens or closes, so you can discover the intruder in time. No complicated installation tools are required. The sensor can be installed in just a few steps. Energy saving and low power consumption, built-in 2 * AAA 3V lithium batteriesbattery life up to more than 1 year. Widely Application: Home, Shop, Office, Hotel, Store, Warehouse. Specification: Item: Door Sensors Alarms Color: White Material: ABS Working Voltage: 3V ( 2*AAA Battery)Included Working Current: 19.59MA Standby Current: < 35UA Connect Method: WIFI ( 802 . 11b / g / n ) Wifi Distance: 30Meter ( No Obstacles ) Installation Distance: < 2CM Trigger Distance: 2-3cm Working Temperature: -10-55 APP: tuya Size: 32*76mm Package Size: 7.8*6.2*2.6cm Package Weight: 40g Package List: 4* Door Sensors Alarms