The stylish A22 amplifier combines superior sound quality, an intuitive user interface and sleek design, enhancing communication in office and call centre environments. It fits neatly under your telephone, reducing desk clutter and the innovative audio switching function gives you the freedom to swap between a telephone call and an audio input from your PC. You can listen to a CD on your computer and still pick up a phone call at the press of a button, using the new Plantronics discreet HL10 handset lifter. The A22 AV is for use on Avaya system