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 powerful TENS & PMS Device.