CQtransceiver RJ9 Wired Calling Center Telephone Headset for Ascom Berkshire Home Office IP Phone MR30 MR51 MR61 Direct connect over the head headset, no additional amplifiers or adapters required 2M coiled wire Flexible boom design allows to adjust mic freely RJ9 connector to replace telephone handset Monaural over-the-head wearing style for comfort and awareness of environment