SMAKN&reg; PT2399 High Performance Karaoke Reverb Board Module w/Preamp Effects 1. Electric PowerPressure :Enter a single power supply , optional AC or DC input , regardless of the positive and negative DC power supply can access . Input voltage range: DC 9V ~ 12V, DC 12V ~ 16V,500ma supply current can be used( You can connect 12V battery-powered use ). 2. The board size : LWH = 75mm * 31mm * 15mm ( size excluding potentiometer handle protruding parts) 3. potentiometer center distance : 20mm 4. Weight: 37 g