FEATURES: 7″ Hands free LCD Remote unlock Adjustable brightness, color and contrast Changeable chord melody (more than 13), Auto Shutdown Built in auto switcher for 2 door camera Hands-free communication, 2 Lock can operate from Screen Built in SMPS power supply Wiring : 4-Wire (Coaxial Cable) TFT resolution : 800(RGB)x480 Working Voltage: AC 220V~230V Working Temperature:-0C~+55C Dimension(LxWxH)-18mm x 235mm x 145mm