Lsgoodcare 3.5mm Mini Portable Stereo Speaker for iPod iPhone MP3 MP4 Player Smartphone Tablet 3.5mm standard connector, Compatible with all devices with 3.5mm connector, such as iPhone, iPod, MP3, MP4, etc Enjoy your music everywhere Working time: more than 10 hours (depends on battery) Powered by 2 AAA 3V batteries (not included) Dual channel