Airmate &Acirc; Ultra Mini Wireless Invisible Bluetooth 4.0 In ear Music Earphone Earbud Headset Headphone with Microphone for iPhone, Samsung, LG, iPad, HTC and most Smartphone Bluetooth Version: V4.0+EDR Wireless Frequency: 2.402-2.480GHz Talk Time: about 4 hours Music Playing Time: about 3 hours Powerful noise noise cancellation circuit (Active Noise Reduction)