💡Features: Phaser Effect Pedal Pure 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: 3.74x1.77x1.89 inch. Weight: 8.47oz (with box). Package list: 1 x Koogo 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 Koogo Music store. Thank you!