BOSS Katana Mini Combo Amplifier Features: Portable combo amplifier for electric guitar 3 amp voicings: Clean, Crunch, and Brown Built-in 3-band EQ and Delay effect 7 watts of power driving a 4" speaker Powered by 6 x AA batteries for up to 7 hours of operation Can be powered via optional AC adapter (not included) Aux input for jamming along with your music player Speaker-emulated headphone/recording output