What is the power supply method of the Xiaomi Smart Doorbell 3S?

For two power supply modes, you can choose either a lithium battery or a hardwired power supply. The Xiaomi Smart Doorbell 3S has a built-in 5200mAh rechargeable lithium battery and the doorbell can be removed and recharged when the battery is low or depleted. For Type-C interface charging, please use the charging adapter of a safety-certified 5V/2A to charge the doorbell.
Wiring installation is only suitable for existing old-fashioned doorbells and speakers. The wiring installation operation is relatively complicated, so it is recommended to operate with caution.