Mooer MSG1 Slow Engine Guitar Volume Pedal Input : 1/ 4"monaur al jack (impedance: 470k Ohms ) Output : 1/ 4"monaural jack (impedance: 100 Ohms) Power Requirements: AC adapter 9V DC (centerminus plug) Current Draw:128 mA Dimensions: 93. 5mm (D) 42mm (W) 52mm (H)