Aiphone - WS-11 Wireless Video Intercom from your door to anywhere Wire free Hassle Free Dect wireless 1.9GHz frequency- no interference from other home appliances Easy installation no wiring required Easy operation Automatic recording Automatically records 3 images per call for up to 100 calls 3 year Warranty Specifications VIDEO DOOR STATION (WL-DA) Power supply 6 x AA Alkaline Batteies ( NOT SUPPLIED ) Operation Temperature -10 to +50 degrees centigrade Dimensions 100(W) x 130(H) x 37(D) mm Weight Approx 220g ( without batteries ) MASTER STATION (WL-1ME) Power supply Built in NI-MH battery (model WLW-BT.E) 2.4V DC ( 2000mah ) Display 2.4" TFT Colour LCD Monitor ( 240 x 320 pixels ) Operation temperature 0 to 40 degrees centigrade Dimensions 57(W) x 150(H) x 27(D) mm Weight Approx 170g ( including batteries ) CHARGING STAND (WLW-CE) + AC adaptor (BLJ06W050040P2-U) Power supply 100v-240v AC 50/60Hz Power consumption 2.4W ( Max ) Operation temperature 0 to 40 degrees centigrade Dimensions 84(W) x 88(H) x 63(D) mm Weight Approx 150gm (without plug)