LotFancy Bluetooth 4.0 Headphones with Mic for iPhone Samsung, All Smart Cell Phones Tablet Computers with Bluetooth Bluetooth 4.0 + A2DP technology let you wirelessly connect to compatible devices Built-in microphone allow clear communication; enables use as a headset, digital noise cancellation technology Ultralight, comfortable, easy-to-wear, 33 feet working distance, up to 5 hours of listening and talking time Compatible with most bluetooth smartphones, tablets and MP3 players Longer batter life: hi-density rechargeable battery built in, delivers up to 5 - 6 hours music or talking time