Adds value to standard and wideband VoIP as well as PBX phone systems, protecting your investment through future telecommunications system upgrades. Clearline audio technology improves call quality, enhances speech clarity, manages echo effect, reduces background noise and equalizes volume to maintain user's listening preferences whatever the quality of incoming calls. Quick Disconnect feature lets user walk away from the phone without removing the headset or losing the call. Easy-to-use with one-button headset/handset selection, plus controls for both incoming and outgoing volume. Features: N/A; Connecting Types: N/A; For Use With: VoIP abd PBX Phone Systems; Accessory Type: Amplifier.