Headset, Over the Head, Two Ear Simple to operate with three buttons on one ear cup. When the unit is turned off, the settings are retained. Comes complete with an ambient-noise compensated dynamic boom microphone that works well even in high noise environments. Ghost voices announce headset settings changes in your ear in your choice of 3 user selectable Languages (English/Spanish/French). Powered by rechargeable battery pack, with up to 20 hours life depending on usage. Low battery warning and automatic shutoff after 2 hours of inactivity, to save batteries.