Product Specification: Screen:7" colour TFT-LCD Effective Pixels:800 x 480 Wiring:4-wire pin end Room to Room intercom:Yes Adapter Input:AC100 - 240V 50-60HZ Adapter Output:DC 15V 1500mA Case:ABS Plastic Working Temperature:-35 °C ~ 55 °C Installation:Wall mounted Dimension:240mm(L) x 150mm(W) x 26mm(H) Function:Intercom, monitor, unlock the door