pro martin Built-in Amplifier Mini Guitar Martin Total Length: Approximately 870mm Maximum Width: Approximately 300mm Scale: Approximately 560mm Nut Width: Approximately 43mm Number of Frets: 18f Neck: Almost straight String Height: Approximately 4mm on the 6th string, approximately 2.8mm on the 1st string at the 12th fret (Adjustment of 1-1.5mm is possible with the saddle) Fret Remaining: Approximately 70-80% Sound check confirmed, no problems when connected to a speaker & amplifier. 9V battery specification. Pulling the volume knob turns the switch on, and sound comes from the speaker. The deep cutaway makes playing in high positions easy and supports aggressive playing. The high playability is also attractive, following various playing styles from fingerstyle solo guitar to flat picking. A mini electric-acoustic guitar with a compact body that is easy to play even for those who are new to guitar. It can handle everything from delicate fingerpicking to powerful picking. Martin Built-in Amplifier Mini Guitar I think it's a rather rare guitar. Thank you for your consideration.