Features: 1. HD Quality Image With 166 Wide Angle View: This doorbell contains a 1.7mm lens with 720p image and 166 wide angle view. You can see clearly who your visitors are from it. 2. 2.4GHz Wi-Fi Connection Supported: This doorbell can connect to your home' s Wi-Fi, it keeps your doorbell always online. Then you can see and talk to your visitor at anytime and anywhere. 3. Remote Viewing: When the doorbell be pressed, a alert message will be sent to your phone, you can see a real-time video and talk to your visitors from your phone wherever you are. 4. Clear Two-way Audio: The two-way audio is clear with echo removal and noise cancellation technology, so that you can talk and hear clearly with your visitors. 5. IR Night Vision Supported: This doorbell supports night vision with IR technology, you can have a clear view no matter at day or night. 24 hours monitoring, you will never miss any visitor. 6. Low Power Consumption: This doorbell needs two 18650 batteries (not included), the Li-on battery features with lower power consumption and ultra-long endurance, which can be used for one to three months. 7. PIR Motion Detection: Advanced PIR motion detecting distance is up to 5 meters. Any suspicious motion will be detected and it will send alert to your phone. We offer three adjustable sensitive levels, they are lowered sensitive, moderate sensitive and high sensitive. You can change sensitive levels according to your demands. 8. Easy Installation: This video doorbell is wireless with no need of cables or lines. What you need to do is to fit the support on the wall with the mounting screws, install the batteries and download the UBell APP, then you can begin using it.