Two-way intercom: WIFI connection, no wire required, realize two-way intercom between the doorbell and mobile phone. Real-time mobile phone, support two-way calls, photos, recording, caring for your family makes you safer. 100 wide-angle lens: High-definition clear video with 100 viewing angle, display details in front of your door, reliable and convenient. Large capacity battery and easy installation: charging cycle without disassembly, built-in 800 MAH high capacity lithium-ion battery , charging time 1.5 hours. The doorbell can be controlled by APP, smart and portable. Portable in size and weight, convenient to install and remove Night vision function: Equipped infrared night vision, automatic opening at night. Wireless connection, ultra-low power consumption, can support multiple accounts to watch online at the same time. Uses: Guests can make video and voice calls. The host can realize visitors' information without opening the door. Doorbell Features: Master: XR872 Memory: 32 MB flash memory p> Sensor: 30W GC0328 CMOS sensor Lens: 100 wide angle lens Sensor performance: supports automatic white balance, automatic lens control gain, automatic backlight compensation Signal-to-noise ratio: 41dB Minimum illumination: 0.8 Lux/F1.4 (color mode), 0.3 Lux /F1.4 (black and white mode) Night vision: 2pcs 850nm28Mil high power infrared light Night vision distance: 1 meter is the best, the longest distance is 3 meters Video format: JPG Video size/frame rate: 480P/7fps Recording method: 1. Press the button to trigger recording; Cloud storage card: 5 seconds (5 images) Battery type/Capacity: Polymer 803035/800 MAH Recording time battery discharge: polymer battery standby for 1 year Network protocol: TCP/IP/HTTP/TCP/UDP/DHCP/DNS/DDNS/NTP/RTP/P2P Wi-Fi connection: 2.4GHz Wi-Fi, support (802.11 b/g/n) Ding Dong: supports RF 433MHZ Ding Dong Storage: supports cloud storage function (without TF card function), 3 days free flow cloud storage" Operating voltage: polymer 803035/3.7V < p>Working current: working current 219mA, deep sleep current 10mA, infrared open working current 280mA USB charging voltage: DC 5V/1.5A Storage temperature (): (0~50) Operating temperature (C): -10~50C, working humidity