Real-time viewing: Open your phone to check the real-time status of the door at any time, even if there is no one at the door, you can wake it up at any time to check. Two-way audio: Use the Tuya Smart App to communicate directly with visitors anywhere through two-way audio. HD night vision: Built-in dual filters automatically switch to night vision mode in dim lighting conditions. No matter how dark the corridor is, you can still take clear photos. IP65 waterproof: The doorbell is IP65 certified to withstand bad weather, waterproof and dustproof design, and outdoor wall-mounted use is not afraid of wind and rain. Rechargeable, easy to install: The doorbell is powered by a 4000mAh battery to ensure long-lasting performance and can be easily installed using tape or screws. Sensor type:1/6.5inch CMOS 300,000 pixels Minimum illumination:0.01Lux Viewing angle:90° Working temperature and humidity:-10℃-60℃ Humidity less than 90% (no condensation) Power supply:built-in 4000mAh (21700) battery; external MICRO-USB 5V 2A Colour:White Material:PC Size:12.45x5.1x4.3cm Package Contents: 1 * video doorbell 1 * indoor dingdong machine 1 * screw package 1 * USB data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.