Would like to see who is outside before opening the door? The door is too far, or you are disabled or elderly person and find it difficult to walk all the way every time? Its no longer a problem with high tech video door phone. With this system you can supervise front door situation at any time, take a picture of the person at the door and store it in memory, communicate with hands-free audio and unlock the door remotely. Wireless monitor can be easily moved around the house. The non-obstacle remote control distance about 150 feet. Built-in memory for 120 colour images. High video quality CCD Night vision camera(no battery, has to be connected to the power source). Built in rechargeable 2400mAh Li-ion battery for monitor. Power supply for the Monitor: DC 6V-1A supplied by adaptor. Power supply for the Camera: DC 12V-1A. Grey color. IF YOU HAVE ANY QUESTIONS, WOULD LIKE TO SEE MANUAL AND WIRING INSTRUCTIONS, PLEASE, CONTACT US BEFORE BUYING! Thank you