The Plantronics S12 Telephone Headset System is a convertible headset that can be used over-the-head or over-the-ear. It features an amplifier that connects to both single-line and multi-line telephones. This system includes noise-canceling technology and a boom microphone for clear communication. Additional features include an in-use indicator, headset stand, volume and tone control, and mute functionality, all with a 7 ft cable length.