Usage:Auto DC Power supply:12-24V DC (Standard adapter: DC 12V/1.5A) Frequency range:Quad-frequency 900/1800/850/1900HMz Digital Input:8 digital inputs(Dry contact) output:8 drivable relay outputs(open-collector outputs) Exterior dimension:96X63X25mm Weight:256 g Usage:gsm sms alarm control system Type:Automatic Door Operators Color:Black Certificate:CE Rohs Show More