Push the white button to the end ,then the kit will have suction The Extractor Vacuum Pump was designed specifically to provide the most powerful suction available for the safe extraction of venoms and poisons. Because the Extractor's double chamber pump action is so powerful, you will not need to use the dangerous scalpel blades or knives associated with less effective bite kits. Because it's a pump and not a syringe, it's easy to use with one hand. Just select which of the four plastic cups best covers the bitten area, attach it to the pump, then a simple push of the plunger with your thumb and the Extractor Pump will quickly and effectively remove venoms and poisons from below your skin. By simply cleaning the cups after each use you may safely reuse the pump over and over again. The Extractor can most effectively retrieve venom from the portions of the body that are outside muscle areas. In muscle areas of the body such as the calf muscles the venom enters the circulatory system much more quickly and the Extractor is not as effective in removing venom in these areas. Retrieving venom can significantly improve your treatment results.