128 x 60 x 23.5mm, 5200 mAh, RF 433Mhz , Wi-Fi Xiaomi Smart Doorbell 3 Smart Doorbell 3 Ultra-clear 2K resolution, watches over your door and home Real-time monitoring丨Doorstep motion notification丨Extra-long 4.8-month battery life丨Ultra-wide angle 24-hour smart motion detections Automatic video recording of movements and notification to your phone Equipped with human body sensor and AI human shape recognition technology, Xiaomi Smart Doorbell 3 monitors abnormal movements of your doorway, and sends notifications to your smartphone once they are detected. Real-time monitoring A doorbell that's also a monitor Low power-consumption and fast wake-up technologies save more energy in standby mode. Supports remote doorbell wake-up and remote viewing of the doorway via a smartphone anytime and anywhere Two-way audio communication, smart voice changer Peace of mind even when home alone When someone rings the doorbell, you can view them in the doorway and communicate with them via your smartphone. Supports voice changer to protects your privacy. Support for personalized settings with customized auto reply Record a fun welcome message and have it play automatically after a visitor presses the doorbell See more with the diagonal 180° ultra-wide view* The new-generation ultra-wide-angle lens increases the vertical angle to 107°, to ensure clear, panoramic monitoring of the entire area in front of the door. Ultra-clear vision with 2K resolution View the doorway in more detail Image quality is further upgraded with 2K resolution for higher quality image capture, not only ensuring good viewing results, but also clearer and more detailed recording of doorstep activity. Clear video even in the dark The 4 built-in 940nm high-power infrared lights* ensure the images are captured clearly even in low or no light. Upgraded battery life Only needs charging 3 times a year* The built-in 5200mAh high-capacity lithium battery further improves battery life, so there is no need for frequent charging and battery replacement. The USB Type-C charging port enables faster and easier charging*. High-volume wireless chime Rings even when disconnected from the Internet With 4 volume settings to choose from, the standard high-volume indoor chime can be heard clearly in noisy environments. "Do not disturb" mode mutes the chime when you don't want to be disturbed. Multiple theft prevention Forced removal alarm + powerful 3M adhesive + screw fixing + one to one account pairing*. When the doorbell detects that it is being removed, it will trigger an alarm, record video and send a notification to your phone.