Introducing the BT H51 Wireless Headset: For excellent sound & outstanding comfort Part of the new BT range of cordless headsets for wireless compatibility with landline and deskphone communications. BT’s first range of wireless headsets compliment the BT business phone range and are ideal for use in both home and office environments. This new convertible headset can be connected directly to PSTN line or deskphone via RJ11 connection. Compatibility with deskphones includes Cisco IP, Avaya, Nortel, and other desk phones. Benefits of the H51 include the freedom and flexibility of hands-free with a range of up to 150 metres away from your desk; a noise-cancelling microphone to reduce interference from background noise to enhance the superior audio quality whilst on calls. Other features include: On/Off button on headset, GAP connectivity, lifter output, leathertte ear cushion, acoustic shock protection and 3 convertible wearing styles (over the head, behind the ear and over the ear).