MATERIAL: High-grade frosted shell, pen shape, sturdy and . Plug and Play: Support up to 32GB TF card. Features:Portable: small size, multifunctional mp3 music player. Multifunctional: it's not only a pen, it's a stylish mp3. 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. Rechargeable: built-in rechargeable lithium battery, battery life up to 4 hours. DTS5.1 Surround Sound Channel: stimulate the potential of sound quality, reduce the true lossless sound quality.