ZKTECO Security Relay Box (ZK-SRB) -Display: 2 LED indicator, Built-in Relay: 1, Reader Support: ZKTeco Standalone devices that have wiegand out, Input Format: Encrypt wiegand, Output Contact: Electric lock, Exit button, Lock Control Delay: Default 5s (Configurable on fingerprint reader/Software), Power In: 12V DC, 60mA, Dimension: 50 x 40 x 17 mm