Features: Support digital music playing of multiple MP3 music formats. It can be used as mobile flash drive to store MP3 songs or data. Support TF memory card, max 16G （Not included）. It can be also used as TF card reader. It also has the functions of MP3 and mobile storage disk. It uses USB1.1/2.0 interface, supporting hot swap, plug and use. Built-in 90mah lithium battery allows for continuous playing for 3-4 hours, without external power supply requirement.Stylish and small shape design enables it to be used as beautiful gift thanks to the exquisite workmanship. Specifications: Material:ABS Length:Approx.90mm/3.54in Color:Black,White,Blue;(Optional) Built-in 90mah lithium battery; USB1.1/2.0 interface Package Includes: 1x Mp3 Player note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.