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 Set Material: Aluminum Alloy Weight: Approx. 47g/ 1.7oz Interface: 1x Mini USB, 1x 3.5mm/ 0.1in, 1x Memory Card Slot Storage Type: Memory card (supports a maximum extension of 8GB(not included in the list) Battery Type: Built-in 250mAh Lithium Battery Working Hours: more than 5 hours Package List: 1 x MP3 1 x Earphone 1 x USB Cable