... rechargeable lithium battery 3.Play time 2-4 hours round speaker , portable, for mobile/notebook/mp3/mp4selling point1.Mini pop up ... to use with MP3, MP4 player, PC, computer, laptop, mobile phone etc.4.Use with rechargable battery,mini,portable,easy to ... glad to answer inquiries. Contact us now.Thank you! round speaker, portable ,for mobile phone/notebook/mp4/mp3 (SP-105)