Plantronics CALISTO P210-A USB Handset for Avaya Softphone, managing PC calls is as simple as pressing a button. Wideband audio provides lifelike voice fidelity and the standard phone keypad design makes this handset an affordable choice for users who are new to a PC-based, calling interface. A noise-canceling microphone optimizes audio quality, and a standard USB cable makes it simple to plug the handset into any computer. Works with your cordless phone, letting you move about your home office and take calls hands-free. And with its unique 3-in-1 design, the headset also allows you to talk hands-free on your cell simply by plugging it into the handset's 2.5 mm jack Wear your MX500i all day long, thanks to a comfortable, ultra-light, single-ear design that makes it easier than ever to be on the phone for hours at a time. The headset's under-the-ear Flex Grip design hugs your ear for greater comfort and improved performance. And thanks to the one-touch volume and mute buttons, you'll have complete control over your calls. Plantronics One-year limited warranty