S10 Phone Amplifier with Convertible Headset S10 Amplifier with Convertible Headset Under-the-telephone design features adjustable headset stand Audible and visual cues adjust volume (incoming and outgoing), tone control and mute Compatible with PLNHL10 Lifter (sold separately) Connects to single- or multi-line telephone; allows you to handle other tasks while talking on the phone. Headset adjusts for over-the-head or over-the-ear use. Adjustable tone control and transmit/receive volume for superior sound. On-line indicator and headset stand included.