DESC: Combining a headset with amplifier, the Practica S50 telephone headset system offers an economical way to provide high-quality sound and hands-free convenience of headsets to offices that already have telephones. The unit is compatible with virtually all single-line and multi-line telephones ranging from rotary dial to PBX systems. It connects in minutes without additional adapters or other special equipment. The S50 has a headset/handset selector and mute function, both with LED indicators. It is also provided with adjustable volume control to deliver clear conversations.