New, Unopened BOSS KATANA:GO KTN-GO Personal Headphone Guitar Amplifier From the product description: BOSS KATANA GO A palm-sized guitar/bass headphone amplifier for enjoyable playing. Guitar mode with 10 types of amps and over 60 types of effects. Bass mode with 3 types of amps and over 60 types of effects. STAGE FEEL function provides an immersive sound field in headphones with spatial audio technology. 30 ready-to-use preset memories. Easy-to-read organic EL display. One-touch tuner function. Bluetooth connection with mobile devices enables wireless audio playback. Rechargeable battery allows for 5 hours of continuous use.