The neckband MP3 player with Earphone is compatible with a various device such as mobile, laptop, tablet, iPod, etc. which can support 1-16 GB card. The user can save your songs in your TF card and then get it played with a sports player and it supports various formats such as MP3, WMA, WAV music format. The user can use it directly as a USB portable disk just by saving the files in it. It has playtime up to 6 hours and it also has an operating system that supports 98/2000/XP, it also supports 20 Hz-20 KHz.