... Li-battery, worry-free power exausted with this mini speaker Applicable to MP3, MP4, Laptop, PC, MID, Mobile phone, etc…all ... pen and desktop, mobile phone, MP3, MP4, MP5, apples, etc., can be easily connected to your computer's USB port ... quality sound, with volume control, adjust the volume according to individual needs Applicable gift occasions: Advertising and promotion, business gifts, holiday, ...