cordless hdset & mod na mitel "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>"