Office Earset system with lifter extends wireless freedom to your softphone. Offers VoIP (Voice over Internet Protocol) applications with remote call detection and answer/end capability via PerSonoCall software. Instant USB connectivity for easy compatibility and quick set-up for softphones. 900MHz IntelliStand base unit automatically answers and ends a call. Take conversations up to 200' with no headset cables. Talk up to eight hours without recharging. Delivers superior sound quality for clear, private, and completely secure calls, including noise-canceling microphone and TIA810a compliance for echo elimination. Features streamlined one-touch volume control and mute button. Quickly converts to your choice of four comfortable wearing styles: over the head, over the ear, behind the neck and dual T-pad headband.