Marketed as an emergency must have, the product fails to deliver when needed. After about a year's time, the capacitor does not hold a charge after minutes of winding the crank. In other words, the flashlight is now useless.I have kept the flashlight/radio in my car and did indeed wind it every three months per the instructions. Even then, it only holds a charge for about 30 seconds and does not illuminate enough to see well.This product is NOT suitable in emergency situations, is marketed deceptively, and should be avoided.RTM