... time 2-4 hours round speaker , portable, for mobile/notebook/mp3/mp4selling point1.Mini pop up, portable, unique design, small case ... effect, wonderful bass, sound beyond size3.Ideal to use with MP3, MP4 player, PC, computer, laptop, mobile phone etc.4.Use ... .Thank you! round speaker, portable ,for mobile phone/notebook/mp4/mp3 (SP-105)