Product Description Equipped infrared night vision, automatically open at night Product name: smart doorbell Main control model: bk7252 Sensor model : gc0328 Light sensitive: support Audio input: 1 channel Audio output: 1 channel Infrared drive: max 50mA 2 keys: doorbell key and RESE-T key Battery not included Maximum resolution: VGA, 640x480 Video coding standard: M jepg VGA 20fps Day night switching mode: automatic Video preview: support, 1-way P2P Sound recording: support Video transmission encryption: support Dingdong RF code: EV1527 Infrared lamp control: automatic, adjust sensitivity level Infrared lamp wavelength: 850nm Distribution mode: Bluetooth -Distribution Cloud Storage: Yes, 3-day rolling storage is provided by default-t Connection mode: 2.4GHz, WiFi (Not support 5G WIFI) Power supply mode: Battery power adapter (battery not included) Firmware upgrade supports remote upgrade Operating temperature:zero