Time will tell but so far I've been very impressed. For your information: This device does not come with a power adapter that ends in a small plug that needs to be plugged into the appropriate socket under the transparent plastic cover. I bought one for a friend who didn't have the $2 AC stuff that plugs into a USB cable. That's a really dumb manufacturer choice. In addition, no instructions for use were included in the package he received from Revain. The blue LED on the far right may blink. This means that the battery level of the device is very low. It flashes until the charge level reaches a certain level, becomes a solid blue light, the LED to its left flashes until it reaches a higher overall charge level. Eventually, all 3 LEDs will glow solid blue. Above these blue indicators is a USB port where you can connect devices such as a cell phone (via the appropriate USB to USB adapter cable). It came with a USB to USB cable with the correct end that fits my last phone I bought. Other phones etc may require different patch cords that fit the large jack on your flashlight and the small jack on your phone, iPad or whatever you need for emergency charging. It's waterproof, meaning it rains. He is not submersible. The case has too many holes for water to flow through. If you drop it in a lake, put it in a warm, dry place and let it dry for about a week. Maybe, like some computers I've spilled cups of tea on, if you don't try to run it while it gets wet and let it dry for a couple of weeks before doing anything else with it, it will work. just my hope If I needed an underwater light source, once I turned it on, I would put it in a suitable fully waterproof case. Then after use I would have to open the case and charge it. The lens hood and the part with the LED are screwed on. So they should remain one. This is probably better than constantly gluing parts to a heavy part with a battery inside. There is a switch under the (tiny) power input connector. I have no idea what to do. If you scroll to https://smile.amazon.com/dp/B08XZ4CQCH?psc=1&ref=ppx_yo2_dt_b_product_details you will see the instructions they should have sent along with the device. Revolution.
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