1. Use microwave radar to detect the alarm, it trigger the alarm as long as someone is standing at the door. 2. 1080P HD video doorbell camera with 4.3 inch display. 3. Built-in 5000mAh rechargeable battery and 5V 1A USB cable power supply, with low battery alarm function. 4. Stay alarm notification, when someone stays at the door, the camera capture and record video at the same time, which can be viewed in playback (memory card required). 5. One-way intercom, can only hear the visitor's voice, can not communicate with the visitor. Clear night vision, provide day and night monitoring. PIR motion detection, 120view angle, APP push notification when detects movement Intelligent playback, if insert micro-SD card, you can view it on APP back at any time, video recording. Download free APP "Smart Life" or "Tuya Smart" from Play or . Camera Viewing Angle: Wide Angle 120 Memory card: Maximum support 128Gb Wifi mode:802.11 b/g Input:5V/1A Applicable door thickness: 35mm-115mm. Applicable door aperture diameter:15mm-36mm. The memory card format used in the doorbell is FAT, and the transmission rate needs to reach C10. Kind reminder: 1.The peephole of this doorbell is a small camera and does not have the function of a doorbell button. 2. After installing the doorbell, if the battery is low, please only use a 5V 1A charger to connect to the doorbell for charging. Other specifications of chargers may burn out the doorbell; 3. Do not unplug the cable between the doorbells for charging, as this can easily damage the cable (when the charging cable is not long enough, a mobile charging plug board needs to be used separately) Color:Black Material:plastic Package Contents: 1 * Door Peepholes Camera 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.