Power Source Built-in AC110V~240V Or Transformer or adaptor( AC 110V~ 240V ) Assurance_temperature -40~+ 50oC Camera 1/3 Inch CMOS OR CCD Lens F=2 Min Illumination 0.1 Lux Monitor CM-06LRH handset Max_Wiring Distance RVV4*0.5 multi-core copper wire for transmission distance within50m, RVV2*0.5 multi-core wire and 75-5 video wire for up to 200m Dimension 166 X 108X 38mm Weight about 3.75kgs Tv System PAL OR NTSC Ring Bell Chime Sound ( Double Ding-Dong Bell) Wiring 4 wires in polarity. ( include Monitor and GND ) Call Function Dual Conversation is available. Call between indoor phones is available Extension this system can extension up to six monitors Door Release function Signal Unlocking LED You can enjoy a constantly clear & bright picture on the screen at any light level from 0.1 Lux (at night or dark Place)by the built-in LED Specification 1. Unique intercom in monitors by broadcasting 2. Six burglar-alarms setting 3. four door stations support maximum six indoor phones 4. Multiple chime rings optional 5. Network applications available