Specification Master Chip T31Sensor device 1080P COMS sensor GC1054Lens 2 2mm 6G wide anglePerspective 120 degrees horizontally 150 degrees diagonallyDay and night conversion Automatic switching of dual filtersPower supply Two 18650 batteries 2200mAH built in Features 1 1080P High Resolution Video The doorbell features a 1080P COMS sensor offering clear high definition footage 2 Two Way Audio With an in built 38dB microphone and 1 speaker the device supports full duplex real time communication 3 Effective Infrared Vision It uses 850nm infrared technology that is effective up to a distance of 5m to provide clear visibility even in the dark 4 Remote WakeupPIR Detection It comes with PIR detection and supports remote wake up for easy and convenient usage 5 Long Battery Life It comes with two built in 18650 batteries 2200mAH for a long lasting power supply that can last upto 6 months if 10 times wakeup a day 30 seconds each time Package Include 1x Doorbell1x Dingdong Machine1x Charging Cable1x Installation Sticker1x Screw Pack1x Manual