This is the newest upgraded 3 in 1 headphone, bluetooth, FM, TF card playing. It adopts bluetooth 4.0 version chip with more clear stereo sound quality. And support phone call and Have wireless sweatproof noise canceling. It's a really good choice for music listening and phone receiving during the sport. Features - Adopt 4.0 version Bluetooth chip, clear stereo sound quality and stable signal transmission. - Stand signal and 10M effective transmission distance(The distance will be shorten if there is any obstacles). - Built in polymer-li battery, longer playtime. - FM Function, play as radio, could enjoy more pleasures. - Support 32GB TF Card, enjoy more music even if without the mobile devices nearby. - Upgraded Headset with TF Card Slot, support 32GD Card, Playing as a MP3, need no any other mobile devices. - With FM function as a radio, just need press the "Mode" key to switch, easy to operate. - With sponge covers, flexible neckband, soft and comfortable wearing. - Durable polymer-li battery, provide playtime up to 5 hrs, stand-by time 112 hrs, talking or listening time 6hrs. Micro-USB charging port is more convenient for charging. Specification - Bluetooth frequency range: 2.4026-2.480GHz. - FM Radio: 87.5-108MHz. - Magnet type: Neodymium. - Speaker diameter: 27 mm. - Rechargeable Battery Type: Polymer Li-ion. - Size: 5.3 * 4.6 * 1.5cm(L * W * H).