Functions: ?can call every customer ?can control the gate and modify the code ?LCD indication, light on back ?the controller will phonate when the customer alarms, and indicate the room No. and condition ?Can store 60 signals. ?Can monitor the gate in and out condition Capacity 500,000 household Power 20VDC Consumption <15W Operating temperature -20~+55°C Dimension Wide 220mm long 270mm thick 50mm Weight 3kg