... : 28.5 x 10.5x 6.0.cm 3. support MP3 play. SpecificationsGuitar Mini Speaker1. Guitar Mini Speaker With TF Slot ... hours.6. SD card, MMC card and U disk, support MP3 play. 7. It has three different interface of the mobile ... , used to enter an external audio source (such as radios, MP3 players, computers, etc), to amplify, as a power amplifier using; note ...