Thank you for viewing! This is the KORG GA-1 guitar/bass tuner. It's simple, easy to use, and its compact size fits in your pocket, making it very convenient for home practice or taking with you. It supports both guitar and bass. Product Features: • Compatible Instruments: Supports guitar (6-string) and bass (4-string, 5-string). • Measurement Range: Wide measurement range, supporting standard tuning to flat tuning. • Compact Design: Lightweight and palm-sized for easy portability. • SOUND Mode: Equipped with a sound mode that outputs a reference tone for tuning by ear. • Input Jack: Features an INPUT jack for direct connection of instruments. Built-in microphone also supports acoustic guitars. • Power: Operates on 2 AAA batteries (batteries not included). Condition: • Operation: Power on, tuning function (meter display, SOUND mode), and input jack operation have been confirmed. • Appearance: There are minor scratches, small marks, and dirt from use (please check the photos). • The battery cover is included (can be seen in the photos, but mentioned for confirmation). • Accessories: Body only. Box, manual, and batteries are not included. Recommended for those starting guitar or bass, or those looking for a secondary portable tuner. Notes: • Please understand that this is a used item before purchasing. • Batteries are not included; please prepare two AAA batteries (AAA SIZE / LR03) yourself. It will be carefully packaged and delivered via anonymous shipping. Instant purchase is welcome.