Korpa 
Rushead Max is a straight-forward, easy to use headphone amplifier for guitar. Inside you'll find all the heat of the world's most famous amplifiers, each with a full range of gain adjustment.You get everything you need for clean natural tone, toasty overdrive, and even heavy metal!
Amps love effects, and Rushead Max also hooks you up with multi-mode, switchablemodulation, delay and reverb effect modules to give your performance that A-list tone. 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.
● 5-knob hi-def tone shaping control
● AMP module with clean, overdrive and distortion amp models based on world-class amplifiers
● Switchable MOD module with chorus, tremolo and flanger effects
● Switchable AMBIENT module with reverb and delay effects
● Aux input for jamming along with any audio player
● Playing anytime, anywhere for up to 5 hours
● Onboard USB charge
