Mitel DECT Cordless Headset Kit (50005712). Includes Mitel Cordless Accessory Module (50005521) and Mitel Wireless Headset with Charging Cradle (5000-5522)<br><br>Features<br> - Operates in the 1.9Ghz Band<br> - DECT 6.0 Certified<br> - Supports Multiple Headset styles (Overhead, On-Ear, and Behind the Neck) Only Over-Head Band Included<br> - Activate/End Button<br> - Volume/Mute Button (Push Up/Down for Volume, Press for Mute)<br> - Supports Mitel Speak@Ease or "0" for Secretary Speed Call<br> - Up to 8 Horus Talk Time<br> - Up to 43 Hours Standby Time<br> - Up to 300ft Range (Varies Depending on Environment)<br> - Out of Range Warning Tone<br> - Includes Jabra 9350 Style Wireless Headset<br> - Cordless Accessory Module Can Be Paired with 2 Devices Simultaneously (DECT Headset and Handset)<br><br>Compatibility<br> - *******Compatible Telephones*******<br> - Mitel MiVoice 5300 Series Telephones (5330, 5330e, 5340, 5340e, and 5360)<br> - Not Compatible with Mitel MiVoice 5320 or 5320e Telephones<br> - *******Compatible Systems*******<br> - Mitel Communications Director Release 5.0 and Higher<br> - Mitel Mi Voice Office 250 (Mitel 5000), Release 5.0 and Higher<br> - Mitel SX-200 ICP Systems Release 4.0 UR3 or Higher<br> - Mitel Boarder Gateway Release 7.0 and Higher<br><br>