... magnetically shielded 2.Built-in rechargeable lithium battery 3.Play time 2-4 hours Mini digital speaker,for mobile/notebook/mp4/mp3selling ... , PC, computer, laptop, mobile phone etc.4.Use with rechargable battery,mini,portable,easy to take ,can enjoy music anywhere and ... glad to answer inquiries. Contact us now.Thank you! mini digital speaker,round,colorfull, for mobile phone/notebook/mp4 (SP-105 ...