... MP3 play. SpecificationsGuitar Mini Speaker1. Guitar Mini Speaker With TF Slot 2. Stereo sound quality, bass, alto ... sound.3. It can be used with mobile phone, all device with 3.5mm4. Guitar style, can ... mode).3. AUX line: matching connectors, used to enter an external audio source (such as radios ... , MP3 players, computers, etc), to amplify, as a power amplifier using; note: when you insert ...