For security and piece of mind at your home, this USB Rechargeable Wireless Smart Wi-Fi Video Doorbell is a great way to monitor your front door via your phone. Features: AI humanoid algorithm helps catch human motion more accurately, avoiding false alarms caused by other objects. When someone is detected within 13FT(4M), the video doorbell will record and sends the alert to your phone instantly. If other activities are also important to you, you can adjust the sensitivity of the motion sensor to high, which can help you record movements from humans, car, pets, etc. This wireless doorbell camera only supports 2.4GHz WiFi(5GHz wifi is not supported), no wires and cables are required. No monthly subscription fees, all the recordings will be saved to the cloud storage automatically for 3 days loops, unlimited storage, 7 level security encryption personal privacy protections, doesn’t support SD card. This doorbell camera is wireless and is equipped with an ultra-low power chip and powerful 6100mAh battery, which can keep the door camera working longer and last about 2 to 4 months in normal use. Please charge the batteries with a micro USB cable (INCLUDED) for 10 hours when first-time use. When the power of the device is lower than 20%, the app will send you a prompt. It comes with a built-in microphone and speaker to talk to the regular visitors or warn the uninvited people. The night vision mode of the video doorbell camera switches automatically, with a 166o wide-angle lens and six 850nm high power infrared lights allowing you to see everything clearly in front of your door at night.