SRB-BL/LOCK 5 WIRE

SRB (Security Relay Box / Smart Relay): This indicates compatibility with a secure signaling layout. In professional access setups (such as ZKTeco systems), an external SRB sits between the reader and the lock to ensure that even if an intruder tampers with the outside reader, the circuit cannot be shorted to force the door open. 5 WIRE Configuration: Unlike standard 2-wire electronic locks that only draw power to pull the latch, a 5-wire lock includes dedicated signal lines for live status tracking.