This is a set of the BOSS GT-1 multi-effects processor and the genuine BOSS AC adapter, the PSA-100. I've used it for several live performances, but it's in pretty good condition with no noticeable scratches. Product Description ■ Guitar Multi-Effects Processor ・ BOSS flagship-level sound quality condensed into a light and compact body. ・ Edge-less design that won't scratch cases or instruments during transport in a soft guitar case. ・ Operates for approximately 7 hours on 4 AA alkaline batteries, making it suitable for street performances. ・ Download professional, ready-to-use tones from BOSS TONE CENTRAL. ・ EASY SELECT for searching patch tones by music genre, etc., and EASY EDIT for intuitive tone adjustment. ・ Extensive expandability with external control, assign functions, USB connection, etc. Main Specifications Sampling Frequency: 44.1 kHz AD Conversion: 24-bit + AF method ※ AF method (Adaptive Focus method) is a Roland/BOSS proprietary method that dramatically improves the SN ratio of the AD converter. DA Conversion: 24-bit Effects: 108 types Memory: 99 (user) + 99 (preset) Phrase Loop: 32 seconds Nominal Input Level: INPUT: -10dBu, AUX IN: -20dBu Maximum Input Level: INPUT: +7dBu, AUX IN: 0dBu Input Impedance: INPUT: 1MΩ, AUX IN: 27kΩ Nominal Output Level: OUTPUT (L/MONO, R): -10dBu, PHONES: -10dBu Output Impedance: OUTPUT (L/MONO, R): 1kΩ, PHONES: 44Ω Recommended Load Impedance: OUTPUT (L/MONO, R): 10kΩ or more, PHONES: 44Ω or more Connectors: INPUT jack, OUTPUT (L/MONO, R) jacks: 1/4-inch phone type CTL2, 3/EXP2 jack: TRS 1/4-inch phone type AUX IN jack: Stereo miniature phone type USB COMPUTER port: USB type B DC IN jack Power Supply: Alkaline battery (AA) x 4, AC adapter (PSA-100 recommended) Current Draw 200 mA Battery life under continuous use Alkaline battery: Approx. 7 hours ※ Varies depending on usage conditions.