Plantronics M10 Amplifier for H101 H101N H31 H41N H51N H171 H261N HW251 Headset, HEADSET OR CORDS NOT INCLUDED The Panasonic M10 universal amplifier is easy to use and works with your choice of Plantronics headsets to deliver precise levels of listening and talking comfort, superior protection, and excellent audio performance. The M10 includes near-universal compatibility with single and multi line telephones. It features an ergonomically designed volume control, headset/handset selection button and mute control. Quick Disconnect between the Plantronics M10 and the headset (headset NOT included) allows you to move away from your phone without removing the headset or disconnecting the call. Universal Amplifier, Telephone/Computer (audio)Selector Switch, Receive Volume Control, Headset/Handset Selection, Call ClarityTM System, Can be Used for Call Recording, Mute Switch. Headset not included, amplifier only.