ZKTeco SRB Security Relay Box control box cover this device can scan ferrous

this device can scan ferrous metals as well as most other forms of them including aluminum alloy

Made From A Rugged Heavyweight Cotton Canvas Material

factory set codes should not be used

They are durable

ZKTeco SRB Security Relay Box control box cover this device can scan ferrousZKTeco 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