Feature:1. Light in weight, portable and easy to carry, can be used for outside activity.2. Backclip design, can be fixed firmly on your cloth or other devices, also suitable for sports.3. Long battery life, can play for more than 5 hours, more convenient to use.4. Builtin memory card expansion slot, supports a maximum extension of 8GB.5. Adopt high quality aluminum alloy material, more durable, provide longer service life.Specification:Item Type: MP3 Music Player SetMaterial: Aluminum AlloyWeight: Approx. 47g/ 1.7ozInterface: 1x Mini USB, 1x 3.5mm/ 0.1in, 1x Memory Card SlotStorage Type: Memory card (supports a maximum extension of 8GB(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 product cannot be connected to a computer.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.