The Sennheiser VMX 200 Bluetooth Headset uses VoiceMax technologyto offer distortion-free voice calls. Two microphones identify thedirection of the sound source, while the built-in software blocksout the surrounding noise. This mobile Bluetooth headset can be connectedsimultaneously to any two Bluetooth devices such as phones and PCs.You can conveniently charge it either via a USB port or using a walladapter. This Bluetooth 3.0 headset has three buttons for easy controlof multiple actions.