Product parameters: Product Name: smart doorbell Main control model: bk7252 Sensor model: gc0328 Photosensitive: support Audio input: 1 channel Audio output: 1 channel Infrared drive: max. 50mA 2 keys: doorbell key and RESE-T key 2 indicators: equipment status indicator and charging indicator Battery interface: 1 way Charging power supply: DC 5V Video coding standard: M jepg Video frame rate: VGA 20fps Day night switching mode: automatic Video preview: support, 1-way P2P Sound acquisition: support Video transmission encryption: support Dingdong RF Code: EV1527 Infrared lamp control: automatic, sensitivity level Adjust Wavelength of infrared lamp: 850nm Distribution mode: Bluetooth distribution Cloud storage: Yes, three-day rolling storage is provided by defaul-t Connection mode: 2.4GHz, WiFi Power supply mode: battery power supply Battery capacity: 1000mah Battery power detection support, voltage is lower than 3.4V, unable to wake up Firmware upgrade supports remote upgrade Operating temperature: - 10 ~ 45 ℃Package Includes: 1 x Doorbell Machine 1 x Internal ding-dong Machine 1 x Charging cable 1 x Adhesive installation aid &n