Feature:1. Built in memory card expansion slot, supports a maximum extension of 32GB.2. The ultra lightweight player can clip on your clothes or other devices and stays in place for a worryfree sport.3. Long battery life, can play for more than 5 hours, no more need to worry of lack of electricity.4. With mini LCD screen display, you can clearly see the progress of the song, more convenient to use.5. Adopt high quality aluminum alloy material, more firm and durable, provide longer service life.Specification:Item Type: MP3 Player SetMaterial: Aluminum AlloyWeight: Approx. 47g/ 1.7ozDisplay: LCD Mini ScreenInterface: 1xMini USB, 1x3.5mm/0.1in, 1xMemory Card SlotStorage Type: Memory card (supports a maximum extension of 32GB(not included in the list)Battery Type: Built-in 250mAh lithium batteryWorking Hours: more than 5 hours .Package List:1 x MP31 x Earphone1 x USB CableNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.The USB of the product is a charging function and cannot be connected to a computer for transmission.