Features:Portable: small size, multifunctional mp3 music player. Multifunctional: it's not only a pen, it's a stylish mp3. Rechargeable: built-in rechargeable lithium battery, battery life up to 4 hours. MATERIAL: High-grade frosted shell, pen shape, sturdy and . Plug and Play: Support up to 32GB TF card. Easy to use operation, download content and use it immediately. Writing and listening to songs shall not be delayed, making you a fashionable person in your circle of friends. DTS5.1 Surround Sound Channel: stimulate the potential of sound quality, reduce the true lossless sound quality. Specification: Product name: MP3 player Battery capacity: 100mAh Charging time: 1 hour Working time: 4 hours Audio format: MP3 Memory Expansion: Maximum support 32GB micro-sd card Operation mode: button Charging interface: micro-usb Material: Plastic colour: black Package Contents: 1 x Pen MP3 Player Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.