Adds value to standard & 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 & 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 & outgoing volume. Features: n/a; Connecting Types: n/a; for Use With: VoIP abd PBX Phone Systems; Accessory Type: Amplifier.