electric control lock 1. Specially used for video talk-back system, remote control system and etc. Universal for left, right, in-swing and out-swing doors. 2. Adopting CPU automatic control, is equipped with automatic detection, Noiseless for opening and closing. 3. Can lock automatically when the door is closed 4. Material of latch bolt: zinc alloy; Length of latch bolt: 20 mm; Lock Size: 130(L) x 105(W)x 41(H) mm; Temperature tolerance: .-20°C +60°C Working voltage:12VDC/AC; Working current: ≤300mA; Static current: 20mA Only keys operate from inside or outside