Using the Zero Tolerance Advanced Penis Pump is easy. First, make sure the pump is fully charged using the included USB cable. Place the soft TPE rubber entry sleeve on your penis and ensure it creates a good seal. Start with the first suction mode and gradually increase the suction speed until you feel comfortable. You can track your progress through the measurements on the see - through tube. If at any time you feel uncomfortable, press the quick - release button immediately. When you're done using the pump, remove the entry sleeve for easy cleaning. You can simply rinse it with water as the pump is splash - proof. Keep the pump in a dry place and avoid exposing it to extreme temperatures. Remember, it's phthalate and latex free, so it's safe for use.