This is a compact KORG tuner compatible with both guitar and bass. It seems you can connect it directly to the instrument without a cable! I haven't been able to test it since I don't own a guitar or bass, but I've confirmed that the power and light turn on! Please consider this when purchasing! This is being sold as junk! - Brand: KORG - Type: Tuner - Compatible Instruments: Guitar/Bass - Functions: ON/OFF switch, Standby function - Design: Compact and portable - Display: LED display