ZKTeco SRB Security Relay Box control box cover even in the hottest and

even in the hottest and most humid of weather

The DMR HD-Series callbox can be programmed to operate as a DMR digital voice two-way radio

Signal-Tech Double Indicator Dots Horizontal Troubleshooting Your Sign

They are durable

ZKTeco SRB Security Relay Box control box cover even in the hottest andZKTeco SRB Security Relay Box The Security Relay Box (SRB) is a value added and cost effective single door controller to enhance access control in a simple and secure way. Designed to provide an added layer of security when connected to ZKteco standalone readers. SRB (not the reader) controls the door lock, thus preventing unauthorized parties from bypassing the door lock when tampering with the reader. Manufacturer's Warranty Period 1 year limited