Monoprice 5-Watt Mono Guitar Amplifier/Portable Recorder - Black With USB Audio Interface, 4-ohm speaker, Guitar Distortion Effects And Micro SD Card Slot 5-watt mono amplifier driving a single 4-ohm speaker The ability to play mp3, wav, and wma files stored on a micro SD card The ability to record 128 Kbps mp3s to a micro SD card Guitar distortion effects | 1/4" TS guitar input jack | 3.5mm microphone input jack | 3.5mm auxiliary input jack | 3.5mm headphone output jack The amplifier is powered by an internal 1500mAh battery.