... and More.With special particular patent in worldwide. Be applicable for MP3, MP4, laptop, PC, MD, mobile phone, and ... Built in magnet inside the speaker case, that will combine the 2 speakers together, and easy to take Used ... 5V +0.5V Suitable temperature: 0 - 40 C Be applicable for MP3, MP4, laptop, PC, MD, mobile phone, and more ... powerful volume It will be the best choice for your journey speaker ...