Xiaomi Smart Doorbell 3

External dimensions: 128 x 60 x 23.5mm Battery capacity: 5200 mAh (TYP) Rated input: 5V⎓2A Wireless connectivity: Wi-Fi IEEE 802.11b/g/n 2.4GHz, RF 433MHz Infrared light: 940 nm infrared light Audio system: Two-way voice calls Storage: Cloud storage Charging temperature: 0°C to 45°C Operating temperature: -10°C to 45°C Operating humidity: 10% to 90% RH, non-condensing Chime Specifications: External dimensions: 60 x 60 x 39.6mm Rated input: 5V⎓1A Wireless connectivity: RF 433Mhz (receiving only) Operating temperature: 0°C to 45°C Operating humidity: 10% to 90% RH, non-condensing