... rechargeable lithium battery 3.Play time 2-4 hours 2012 new speaker ,round for mobile/notebook/mp3/mp4selling point1.Mini pop up, portable ... beyond size3.Ideal to use with MP3, MP4 player, PC, computer, laptop, mobile phone etc.4.Use with rechargable battery,mini,portable,easy ... are glad to answer inquiries. Contact us now.Thank you! 2012 new speaker,round, for mobile phone/notebook/mp4/mp3 (SP-105)