Sport Mp3 Player Wireless Fm Radio Headset Headphones Earphone Auricular Micro Sd Tf Card New 2013 Fashion Jogging Earphones Neckband Sports Earphones, simple to operate by steps written in below Product Description. Packagaing instructions are not in English, if you do care about it, please do NOT buy it Music Earphones for jogging, enjoy life MP3 Player, 3.5mm connector, Built-in FM function and TF/Micro SD card slot Built-in rechargeable Li-PO battery, long running time Size:120X160X50mm(LxWxH), that is 4.7X6.3X2inches