Come and see our amazing products. The built-In squeeze action trigger winds interior gears give the bulb energy to shine its light. A optimal learning and enjoyment exercise in mechanical engineering with children in science class. Squeeze the handle a few times, and the three bright Led lights are ready to go. The product includes a handy wrist lanyard and a locking mechanism that holds the handle in place when not in use. The emergency flashlight is a long duration survival flashlight that needs no batteries to operate. Pls confirm with us about the packing info, stock color and exact production time before placing your order.