Panda Portable Mini Speaker with built in MP3 Player for MicroSD Cards Li-Ion Portable Powered Speaker for MP3/MP4, Mobile Phones and Portable Consoles. Features Can be used as a portable powered speaker for any device with a earphone output like MP3 players and multimedia mobile phones. You can listen to MP3 music files stored in a MicroSD or MicroSDHC memory card. When used as a MP3 player you can use the integrated speaker or you own 3.5mm jack earphones. The integrated Li-ion battery can be charged with the included power cable using any powered USB port, from a computer, powered USB HUB or standalone USB power supply. Specifications Integrated Speaker: 40mm, 2.4W, 4Ohm, 200Hz-12KHz Support standard MP3 music files Work time: Approximately 4 hours on a full charge power Input: 5V DC +/- 5% USB Type-A port. Storage: Support TF (MicroSD/HC) Memory Cards up to 8GB* Earphone Jack: 3.5 mm Stereo Jack Line Input: 3.5 mm Stereo Jack Battery Type: 3.7V/300mAh Lithium-Ion Rechargeable Battery (Integrated) Dimensions: 70 x 70 x 27 mm Approximate Weight: 90g Packing type: Transparent Blister Box Contents Panda Portable Mini Speaker - TF/MicroSD MP3 Player Charge USB Cable 3.5mm Jack Stereo Audio Cable *Memory card required for stand alone MP3 Playback (not included). No internal memory is built in. USB port used only for power supply dutties, any 5V USB port can be used to charge the battery.