Designed for communications wiring installation and repair to quickly verify the quality of a new installation. Affordable Headset for hands-free operation. Rugged design for demanding use. Compact design and durable belt clip make it easy to carry. Adjustable volume. Tone/Pulse dialing. Last number redial. Line polarity indication. Microphone mute. Data safe monitor mode. Replaceable premium cordset with telco-style clips. Built-in ringer.