Xiamen Headleader Technology Co., Ltd. is one of the most famous mainboard manufacturers and suppliers in China,Website:http://www.locker-supplier.com, equipped with a productive factory, we are able to offer you mainboard manufacturing.Headleader Mainboard is the controller board of Head leader locker control system. It is connected to computers and relay boards which are connected to locks.Specifications.●Dimensions: L170 x W114.5mm●Installation: φ4●InterfacesA: Power-In for 12-18VB: RS232 for barcode scannerC: RS232 for computerD: Power-out to right lock control boardE: For data cable to right lock control boardF: Power-out to left lock control boardG: For data cable to left lock control boardH: RFIC/ID ScannerI: AC power off checkJ: Power supply 5V for 1D/2D scanner●A Mainboard can control as many as 15 lock control boards at left side and 15 lat right side.For more information, please contact us at Sales@eheadleader.com, or talk to us on skype: Jenny@eheadleader.com, Gloria@eheadleader.com.