Small Insulin Cooler pen-cap by TempraMed | VIVI CAP1 for Eli Lilly KwikPen | Keeps insulin cool | For daily use and travel | FDA Registered

I was not sure at first but went on vacation to Europe which was very hot and was camping so no known refrigerators around. It kept my insulin cool just like I had taken it out of the fridge. The green lights keeps you informed that it is working. I have since bought another for back up. Could not live without it being diabetic.