Built around the AudioDNA”DigiTech's proprietary, incredibly powerful 24-bit guitar processing chip”the DigiTech RP50 Guitar Effects Pedal creates the most realistic amp and cabinet models you've ever heard. 11 amp models, cab and acoustic modeling, studio-quality effects including whammy, wah, chorus, phaser, tremolo, rotary speaker, delay, reverb, and much more. Built-in tuner features an arc array of 13 LEDs. The guitar pedal even has an onboard drum machine with 30 different patterns. The DigiTech RP50 pedal comes with power supply unit.