Specifications Power supply AC DC 9VBoard size 80mm x 50mmRemote controller length 88mmPotentiometer handle length 20mm Features Audio amplifier volume control board microprocessor Potentiometers ALPS potentiometer durable With remote indication status With remote control switch machine function Not include relay Each boot automatically transferred to the smallest sound and automatically transferred to the 9 oclock position very intelligent so it can ensure not appear every time you turn a great voice Package included 1 x AC DC 9V Volume control board1 x Remote controller does not include the battery