1. Smart Visual Doorbell: Intelligent visual doorbell, wireless home low-power remote intercom. 2. Remote Monitor: When the doorbell rings, you can check the visitor's situation through the mobile phone APP. 3. USB Ding-dong Matching: USB Ding-dong matching, not to miss every visitor. 4. Infrared Night Vision: Infrared high-definition night vision can clearly see visitors at night, and eliminate potential safety hazards. 5.Signal penetration ,no longer have to worry about no signal, no sound, Weight: 1.10231131 pounds, Manufacturer: NGBFF