Special Features:

Mobile telephone headset amplifier allows user to talk on phone 150 ft. From base unit; connects to single or multi-line corded telephones; phone, talk, mute and charge indicator lights; pager/locator for remote unit; channel change; mute indicator light; compatible with plantronics 2.5mm to quick disconnect h-series headsets; 9v DC 800ma; 120v AC adapter provided; nimh battery; 80 hr. Stand-by time; 900 mhz

Properties:

An electronic device whose audio frequency input signals control power from a source independant of the input signal and delivers audio frequency output signals of greater amplitude with respect to current and/or voltage. The output signals characteristics are uniformly related to the input signals. It operates at frequencies of 20 kilohertzs and below. It may or may not have signal switching capabilities.