The T-Link is a simple and discreet, dual ear, hands-free silhouette headset with built-in microphone that gives hearing aid users interference-free use of cellular and cordless phones. Suitable for use with all types of hearing aids with a t-coil, the T-Link can be used with most phone types. Batteries are not required for operation. It comes with a 2.5mm jack plug. At less than 2mm thick, the T-Link is comfortable to wear with BTE hearing aids and eyeglasses. The T-Link Headset comes with a one year warranty.