... camera, color display, intercom & chimes 3. Built-in memory, 2.4 inch screen Features:1. 4-in-1 security door viewer,built ... 112 x 23 mm (4.5 x 4.4 x 0.9 in) Outdoor Unit Size (W x H x D ... 21 mm (1.5 x 3 x 0.8 in) N.W:0.26kg G.W:0.6kgLCD Screen TFT color type, 115 ... selections Power AA size alkaline battery x 4 Operation Temperature 0 - 50ºC (32 - 122ºF) Operation Humidity 10 - 90% Door ...