Wireless Bluetooth 4.0 Earphone with In-earbuds Designe Microphone and Voice Guidance Noise reduction & Echo cancellation : Special headset design electronics technology filter wind noise ,improve call clarify Active pairing: Super easy and fast paring with your smart phone or other Bluetooth device Voice command: Built-in microphone,say Built-in rechargeable Li-ion battery: up to 5 hours continuous play, 200 hours standby Bluetooth headset bluetooth 4.0 stereo music movement