The GN9120 Duo Flex headset provides full wireless freedom to move about the office, yet still keeps you in touch. With an incredible range of up to 300 ft, up to 8 hours of talk time and a host of dazzling features, the GN 9120 lets you get more done. What?s more, you can now accessorize your GN 9120 giving it even more features and functionality. Supports electronic hook switch functionality for remote answer/end and ring tone signaling.