The Yamaha AG03 is a compact audio interface that allows you to connect a guitar and headset. - Model: AG03 - Input Terminals: LINE, GUITAR, HEADSET - Output Terminals: MONITOR OUT, STREAMING OUT - Functions: COMP, REVERB, MUTE, LOOPBACK - Power: +48V, -16V - Serial Number: AG03M2 - Monitor Function: MONITOR I have been using it for several months. There are some stains and scratches, but it can be used normally. Thank you for looking.