... outstanding5. Mini, portable digital speaker for your convenience, connecting to your MP3,MP4, CD, DVD, iPod, iPhone, GPS, ... amplifier8.Several colors and power supply manners including battery, computer USB, adaptor DC-5V allow you to enjoy the music, ... temperature-10 °C ~ 55 °CPower supply5V/1000Ma, AC power adapter.Spread spectrumFrequency Hopping Spread SpectrumWorking timeOne full charging, ...