Check the listing for details. Smart Video Doorbell with HD Video APP Security Intercom Night Vision Chime. Condition: New. Listed at 19.99 USD. It only supports 2.4G WIFI nextwork. Before scanning the code, insert something into the button at the bottom right of the doorbell for about 4 seconds. When scanning, keep the distance between the phone QR code and the camera at 10CM-20CM, do not shake, and ensure sufficient lighting Fully charge the doorbell before installation DC 5V 2A 75° viewing angle Remote Control Wireless Connectivity Technology HD Resolution Waterproof Wireless Wi-Fi function 400mAh Rechargeable Lithium Battery Receiving distance 150meters in open area Charging 1.5-2 hours for using 3month Unlimited cloud storage,ready to view at any time. How to pair singles 1 connect USB end of receiver to power supply 2 long press receiver pair key for 3 seconds to lights flashing 3 press doorbell to receiver ringing.Paring is successful.