... bass resonance 4.cable,enabling great portablility 5.Vacuum Bas Mobile Phone speaker,mini portable speaker,Notebook speaker1..The special innovative design ... ,MP4 player, PC & MOBILE PHONE,MD,CD,PDA,PSP and other digital products with audio frequency output ·Lithium battery input:3.7V·Speakers ... :D36mm*1·Charge voltage: 4.2V·SNR>89db·Battery capacity:300mAh·Dimension: D(52MM)*H(64.5mm) ·NET ...