Memory: 32Mb flash Sensor: 30W GC0328 CMOS sensor Lens: 100 wide-angle lens, sensor performance: support automatic white balance, automatic gain control, automatic backlight compensation Signal to noise ratio: 41dB Minimum illumination: 0.8Lux/F1.4 (color mode), 0.3Lux/F1.4 (black and white mode) Night vision: two 850nm 28Mil high-power infrared lamp night vision distance: 1m is the best, and the longest distance is 3m Video size/frame rate: 480P/7fps Recording mode: 1. Press the key to trigger recording Battery type/capacity: polymer 803035/800MAH Battery discharge time: polymer battery sleep and standby for 1 year Dingdong: support RF 433MHZ Dingdong Storage: supports cloud storage function (without TF card function), and 3-day free circular cloud storage Working voltage: polymer 803035/3.7V Operating current: operating current 219mA, deep sleep current 10mA, open infrared operating current 280mA USB charging voltage: DC 5V/1.5A Rules for APP access to doorbell: 1 master account+8 shared accounts=9 users can connect to doorbell, only 3 users can preview the screen at the same time, and only one user can talk to doorbell at a time Purpose: Video voice call and short time video recording are available when guests visit, and the host can know the information of the visitors without opening the door Features: Wireless connection, ultra-low power consumption, multiple accounts can be simultaneously viewed online