Bluetooth Z9 Blueant headest Z9 Bluetooth Headset from BlueAnt with Voice Isolation Technology(TM). The Z9 incorporates two Voice Isolation modes that a user can switch between when making a call: Voice Isolation Standard for use in normal everyday environments providing a natural sounding voice while removing mild background noise and Voice Isolation Max to provide superior intelligible voice clarity for use in extreme noise environments. Product includes: User Guide, USB Charging Cable, AC Wall Charger, Car Charger, One removable ear-hook. Bluetooth v2.0 Headset Profile, Hands-Free Profile Up to 10 meters RF Coverage Carrier Frequency 2.402 ~ 2.480GHz Mini USB Type A – For charging battery Firmware Upgradable 3.7V Lithium Polymer Battery Talk Time: Up to 5.5 Hours Stand-By Time: 200 Hours Published Weight: 10 grams Different ring-tones for known and unknown contacts