Speaker, Applicable for ipod, MP4 Player, Laptop, PC and More.With special particular patent in worldwide. Be applicable for MP3, MP4, laptop, ... /R 380mV Power output: 1.7W S/N: 80dB AMP frequency range: 280-16KHz Charge voltage: 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