【TRUE WIRELESS AND EASY INSTALLATION】No wires and cables, just download the APP, connect it to your doorbell, press the doorbell and you can see, hear and talk to your visitors from anywhere via instant mobile notifications. 【Two-way audio】Allow you to talk to your visitors no matter where you are. You can watch live video on your phone. Infrared night vision allows you to take photos and videos at any time of the day or night. If you have a doorbell in front of your door and want to hear it in the living room, you need a ding dong machine. It can be connected to the doorbell so that you can hear it in your living room or bedroom. (excluding dingdong device and data cable) 【Low power consumption, long standby time】The video doorbell is powered by three 18650 lithium batteries. Thanks to the ultra-low power consumption technology, the smart doorbell works for more than 6 months in this mode, and the standby time is more than a year. (Tip: After receiving the product, please remember to