MX500C HDSET FOR CORDLESS PHONES The award-winning MX500C Mobile Headset from Plantronics delivers high-performance sound for clearer calls. Interchangeable pivoting WindSmart voice tubes provide wind noise reduction technology and can be positioned for optimal sound clarity. The next-generation Flex Grip design provides a secure, comfortable fit for extended wear. Convenient in-line controls put your phone's functionality at your fingertips.