The MP3 player has long standby time because of its high-performance rechargeable battery. The use of ultra-small size and lavalier design enables it to be clipped at will. MP3 player also has mobile flash drive function to store MP3 songs or data anytime and anywhere. It is easy to use without external power supply because of its hot plug and play design. It is made of high-quality metal material, which is wear-resistant and durable. The length of the product is 4.3cm, the width is 2.3cm and the height is 1.4cm. It is very suitable for student, sports, running and travel, etc. Item Name: MP3 Player Material: Metal Inteface: USB1.1/2.0 Headphone Jack: 3.5mm Battery Capacity: 90mAh (Included) Supported Audio Format: MP3 Memory Card Type: TF Card (TF Card Not Included) Endurance Time: 4 Hours Compatible Platforms: for Win98/SE/ME/2000/XP or Above Features: Portable, Metal Clip Design, Long Standby Time Size Details: 4.3cm x 2.3cm x 1.4cm/1.69" x 0.91" x 0.55" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x MP3 Player (Charging Cable Not Included)