SDC 1511TNDKV Tandem Delayed Egress EM Lock Fixed Delayed Surface Mount 1650lbs. 12 24VDC Aluminum Fire Rated Grade 1 Push Bar Capacity 4 TB Interface SATA Capacity 4 TB Interface SATA 6 GB s Cameras Supported up to 64 Cache 256 MB Maximum Sustained Transfer Rate 180 MB s Startup Current front panel RS232 One (1) Port for PC Communication and Keyboard RS485 One (1) Connection for PTZ Control Electrical Power Supply Single The 1511T series incorporates all ExitCheck® features for double door applications through a slave lock output to enable the use of two units for pairs of doors to ensure pushing either door leaf will cause both doors to release Construction: Solid Metal Lock Function: Tandem Delayed Egress Holding Force: 1650 LB 748 KG Voltage: 12 24VDC Voltage Sensing Input Current: 1