... access controller RD-6698D time attendance access controllerTechnical parameters:1.Working Voltage: 12VDC, 3A2.Communicating mode: RD-485 communication3.Records capacity: RD-6698C/ ... the lock to open freely6.Checking Status: RD-6698C is twin-door controller, RD-6698D is four-door controller, they 7.both ... :QTY/CTN: 5pcsMeas/CTN: 47.5x38x27cmW/CTN: 12.5kg RD-6698D time attendance access controller