Directions for use: • Press the wire plug to the output port at the top of the unit; Connect the electrode pads to the electrode wire by inserting pins to the female pin electrodes; Make sure each part connected firmly. • Remove the protective film and place the electrode pads on the targeted area, making sure that both pads are attached on the skin tightly and not overlapping; • Turn on the unit via the on/off switch; it will automatically start from mode 1 and level 1; • Change the modes by pressing one of the 15 different mode buttons displayed on the front of your device; •To Control your A1/A2 ports use the intensity buttons located on the left hand side of the device. Increase the intensity by pressing intensity (+) button for the channel A in use; Please increase the intensity gradually and gently to test your acceptance level of the intensity; to decrease the strength, press the (-) button for the channel A in use; To control your B1/B2 ports use the intensity buttons located on the right-hand side of the device. Gradually increase the intensity by pressing intensity (+) button for the channel B in use; to decrease the strength, press the (-) button for the channel B in use; •Intensity should be set at a level where you will experience some muscular vibration and involuntary muscle movements. It should be set to give a "comfortable" treatment. The treatment should not be painful •Gradually and gently increase the frequency by pressing speed (+) button for the channel in use; to decrease the speed, press the (-) button for the channel in use; •To Control your A1/A2, B1/B2 ports use the speed buttons located on the front of the device. *Please follow the Directions for use in our user manual carefully. Incorrect operation might cause unexpected shocking. *YK15AB is a HIGH INTENSITY TENS&PMS Device.