We are bluetooth supplier, with low cost but hight quality, to win the multile benifit, all of our Bluetooth are removable earhook to allow the headset to be worn on either ear Advanced volume controls include orientation technology to assure that volume controls will always be upright Blue LED light to notify when the headset is in use, or turn off this feature if you choose bluetooth 1.2 provides quicker pairing, better audio with less dropped calls and reduced interference from other devices.