... audio speaker, such as floor, table, wall, window, desk, wooden, metal, plastic and any hard materials.(PS: A wooden desk is the best great ... in rechargeable lithium battery, USB powered,more powerful, clean sound, and better bass, amazing sound in tiny size.4). Portable, ... fashionable design, simple, durable, portable, and DIY music. 5). Support MP3, MP4, IPod, I Phone, ...