Model VBLC015-K2 - Battery, Lock Controller with Battery Back-Up, Uses ViRDI PSU (ACC150), RS-485 Communication, Wiegand 34 bit Communication, 1 x 5A Relay for lock control, battery charge circuit (12V - 13,8V), lock override/exit sensor control. Drop out protection, Can power 2 x ViRDI Terminals and 1 x Lock, Includes VIRDI PSU in Box, excludes 12V battery.