While this woman was practicing injecting her EpiPen, she accidentally injected the needle into her thumb instead of the orange, landing her in the ER. This self-injecting device, called an adrenaline auto-injector, is designed to deliver a quick, life-saving dose of medication during severe allergic reactions until medical help arrives. It releases the medication through a spring-loaded, 1-inch needle that activates when pressed against the thigh. But some people mistakenly place their thumb on the back, which isn’t necessary and can lead to accidents. The key to using it correctly is simple: Blue to the sky and orange to the thigh.