TRUE WIRELESS AND EASY INSTALLATIONNo wires and cables, just download the APP, then connect it to your doorbell, press the doorbell, you can see, hear and talk to your visitors from anywhere, and through instant Mobile alerts. Two-way AudioLet you 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, day or night. If you have a doorbell outside your door and want to hear it in the living room, you need a ding-dong machine. It can be hooked up to the doorbell so you can hear it in your living room or bedroom. (excluding Dingdong machine and data cable) Low Power Consumption, Long StandbyThe video doorbell runs on three 18650 pointed lithium batteries. Using ultra-low power consumption technology, in this mode, the smart doorbell works for more than 6 months and standby time for more than one year. (Tip: After getting the product, please remember to tear off the insulating sheet on the battery for normal use.) PLEASE NOTE: To avoid battery failure to charge. Please charge the battery before 20% remaining. motion detection The bell doorbell has a sensitive dynamic monitoring function to remind you whether there is someone in front of the door at any time. 166 wide angle The 166 wide angle allows the video doorbell to see any movement in front of the door, protecting your home. two modes 720 HD mode and night vision mode can be changed at any time to meet your needs. doorbell The Ring Doorbell works with the Ding-Dong Bell, allowing you to hear the bright doorbell from anywhere in the room. IP55 waterproof IP55 waterproof grade effect, let you put the doorbell safely in front of the door, escort your home. Monitor at any time Easy to operate, no matter where you are, you can check the camera doorbell monitoring or chat with visitors anytime.