Battery for 2 years. 1. This infrared detector cannot be used alone and must be used with the alarm host.2.All the alarm hosts in our store can be used with this infrared detector.3. The alarm host used to match the infrared detector must meet three conditions:A. Frequency: 433MHzB. IC model number: 1527C. Resistance 330K ohms PIR detector PA-92R Working voltage: 3V AAA*2 alkaline batteryWorking current: 25mAStatic current: 30uAEmission frequency: 315MHz/433MHz (ASK) 868MHz (FSK)Emission power: 10dBEmission distance: 80m(open space)Detecting distance: 8m~12m (25 )Working temperature: -10 ~55Installation: wallInstallation height: 1.8~2.2mDetecting angle: 110° Anti-theft security pictures 1. This infrared detector can detect strangers who break into your home.2. When it detects a stranger, it will transmit the signal to the alarm host.3.When the alarm host receives the signal from the infrared detector, it will alarm. Then send the alarm signal to your phone.Notify you that a stranger has broken into your home. Internal structure Place of use