Product Features 1. 700TVL IR night vision camera, 7 inch white indoor monitor. Has 25 ringtones for choice. 2. Work with 4-core connection system. The maximum distance is 100 meters. Different distances use different cables. 3. Hands-free dual-way intercom and indoor monitoring. When a visitor rings the doorbell, the monitor will be activated and display the image outside. Press the answer button, then you can talk outside, press Press the answer button again to deactivate it. 4. Can be connected to the electric lock. You can open the door with the unlock button on the indoor monitor. 5. Suitable for 3 different families/apartments. Each call button can connect to one indoor monitor. Product Technical Parameters Outdoor Camera Camera Resolution: 700TVL Night Vision: Up to 2 meters Viewing Angle: 85-90° Power Supply: Power supply from the unit indoor Most distance: 100 meters Suitable for: multiple apartments Material: ABS plastic Wire system: Wire system 4 Wire Indoor Monitor Screen: