Features: Phaser Effect PedalPure analog phaser effect, warm and plump sound. 2 working modes: Vintage-perfect reproduction of the classic psychedelic phase-shifting effect of 1974. Modern-a deeper, modern full-scale effect. True bypass provides transparent tone. LED indicator shows the working state. Small and exquisite design with aluminum alloy shell. Specifications:Input: 1/4” Monaural Jack (Impedance: 470K Ohms).Output: 1/4” Monaural Jack (Impedance: 10K Ohms).Power supply: DC 9V (plug polarity is negative in the center). Working current: 6mADimensions: 3.74×1.77×1.89 inch. Weight: 8.47oz (with box).Packagelist:1 x Amuzik Phaser effect pedal 1 x user manual Notes: Please note this pedal can NOT powered by batteries.Need a DC 9V power supply with negative in the center to power up.Pleae buy it separately at Amuzik store. Thank you!