Beteran Syllable G08 Miracle Bluetooth 2.4+EDR Wireless Active Noise Reduction Super Bass Multitfunction Foldable Portable Stereo HD Voice Studio DJ HIFI Headset Headphone Earphone with Dual MicPhone for Iphone Samsung HTC Lg Blackberry (White) With built-in noise cancelling installment,this headphone can cut off outer noise by active noise cancellation.Noise cancelling level is 10DB-15DB. Bluetooth: 2.4GHz frequency,10m working range Adopts diameter 40MM high fidelity compound membrane loudspeaker,its sensitivity is 120DB.Built-in high definition high fidelity audio amplifier Multi-functional Keys: Power On/Off, Previous/Next Song, Mute,Volume +/-, Light Lithium battery: 400 mAh, charging time 2 to 3 hours, working time 8 hours, Long standby time of 180 hours