Product Description Description: Note: The zigbee door and window sensor cannot be used alone, it needs to be equipped with a zigbee 3.0 gateway and cannot be used alone. zigbee Door Sensor： zigbee Door Sensor highly sensitive smart wireless door window sensor sends a notification to your smartphone, if a window or door opens or closes when you’re away from home. Providing you privacy, security and peace of mind you can keep an eye your children and elder's safety, catch up potential burglars trying to sneak into your home. Specifications: Battery-powered door sensor: Built-in 1 CR2032 battery (non-rechargeable battery) Working time: 1 year (10 times a day) Standby current: 13uA Working current: 65mA Maximum current: 100 mA Note: The zigbee door and window sensor cannot be used alone, it needs to be equipped with a zigbee 3.0 gateway and cannot be used alone. Package Included: 1*Door and window sensor