Specifications Dimension: 3.94 X 3.48 X 1.24 ineches Weight: 2.4 oz. 1. LEVEL: Controls the overall volume level 2. TONE: Controls the tone balance 3. AMBIENT: Controls the ambient module effect amount 4. MOD: Controls the mod module effect amount 5. GAIN: Turn it up for more gain 6. AUX IN: 1/8” stereo audio input for you to jam with your favorite backing track 7. Phones: 1/8” stereo output jack to connect your headphones or other devices 8. LED: Shows the battery level status 9. USB: Charge it with the USB cable 1) *ECHO: Produces a warm, natural analog echo effect * REVERB: Simulates the clean, acoustic delay sound in a performance hall * ECHOVERB: Combines echo and reverb in one 2)*FLOW: Produces a pure, flowing chorus effect *TREM: Produces a classic optical tremolo sound *DEEP: Produces an ocean-esque flanger tone 3) *CL: Based on vintage SVT style amps, providing a natural * OD: Based on legendary US style amps AGS tone, providing a warm *DIST: Based on famous Finnish amps, providing a grainy Excellent Effects Amps love effects. Rushead Max Bass also hooks you up with multi-mode, switchable modulation, accompanied with echo and reverb effect module to give your performance that A-list tone. Practive Tool And Tour Partner A special designed lithium battery is for powering the amp and bringing you over five hours of continuous use charged by USB. An AUX IN jack bestows upon you the right to jam on your favorite tracks. Everything Your Need Rushead Max Bass is a straight-forward, easy to use headphone amplifier for bass guitars. Inside you'll find the heat of the world's most famous amplifiers, each with a full range of timbre adjustment. From sheer clean natural sound, to toasty heavy overdrive tone, we bring them all together just for you.