Name Xiaomi Smart Doorbell 3S Product Model MJML07-FJ External Dimensions 146 × 52 × 29mm IP Rating IP65 Battery Capacity 5200mAh (typ) Rated Input 5V⎓2A (Type-C port); 8-24VAC, 10-40VA, 50–60Hz (doorbell AC transformer) 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 Charging Temperature 0℃ to 45℃ Operating Temperature -20℃ to 50℃ Operating Humidity 10%-90% RH, non-condensing