... card speaker, high-fidelity, low-power; for MP3,notebook,cellphone;aluminum shape;last for 4 hours Product Features:1. TF ... offer your perfect sound5. Buddy Jack connects different speakers together for enhanced sound6. One-key intelligent control: pause, play, previous ... PC, Mobile, Mp3, Mp4, TV, PSP .etc8. Inbuilt Rechargeable lithium battery, multiple circuit protection, play time up to more than 4 ...