QS-M needle free injector is made using high technology equipment and good quality materials. This device is designed and used for subcutaneous medication. Insulin injection is our only certified field, but theoretically they can be used in all subcutaneous injection fields and there are indeed lots of customers using them in the application of enzymes, anesthetics, fat-burning etc. Because QS-M needle free injector have no needle, they will bring very tiny pain and invasion and no risk of needle injury, needle breakage and cross contamination.