Power Source Transformer or adaptor( AC 110V -240V ) Assurance_temperature -40~+ 50oC Camera 1/3’ CCD or CMOS (color or B/W) Lens F=2 ; Viewing angle=92.8° Min Illumination 0.1 Lux; Resolution>450 lines Monitor CM-06DNRG (color or B/W) Max_Wiring Distance RVV4x0.5 multi-core copper wire for transmission distance within 50m, RVV2x0.5 multi-core copper wire and 75-5 video wire for up to 200m Dimension 442x290x84mm(color box for 1 set) Weight about 3.5kgs/set Tv System PAL or NTSC Ring Bell Ding-Dong Wiring 4 wires in polarity. Call Function Dual Conversation is available. Call between monitors is available Extension One door station supports four indoor phones,including one main indoor phone and three extra indoor phones. 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)