Guyatone GPX-5 Here it is. Simple cleaning and operation have been confirmed. Adapter and battery operation have also been confirmed. There are scratches, but there are no problems with use. Immediate purchase is OK. Thank you. A multi-functional guitar preamp with piezo blend function, allowing for a wide range of sound creation. - Model Name: GPX-5 - Brand: Guyatone - Type: Guitar Preamp - Function: Piezo Blend Function - Frequency Band: 80Hz - 4kHz - Controls: Level, Tone, Piezo, Blend - Output Terminals: 1/4 inch jack - Input Terminals: 1/4 inch jack Thank you for viewing.