The unit has 2 x 2.5 mm jack plug fittings, and is multi function.
Takes 2 AAA type batteries.
They are very easy to use, Side dial is for low to high pulse rate strength, Top button is the power on/off,
Lower buttons are for different massage modes, Auto button does all three modes one after another, Bottom button increases the speed rate.
Made in Korea.
PLEASE NOTE: PRESS AND HOLD THE RED ON BUTTON FOR 5 SECONDS TO TURN THE UNIT ON