Easy to use, and you will need 3 D batteries. The bottom twists off and goes back on in a specific fashion, make sure you line everything up correctly. The multi-function capabilities are very nice from SOS to flashlight to lantern. High power will give you close to 8 hours and low power over 25 hours of use. Very straightforward use and durable if dropped onto the ground. I've not tried in on concrete but I'm sure it's only time before it falls out of the back of the SUV onto the road when unpacking.
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