Asked Revain tech support and they couldn't figure it out either. I worked as an optics engineer for 50 years, but the product manual was missing some key information on how to open the battery compartment. Once you see it, the compartment becomes obvious, but it's covered in a sticker that hides its purpose. Please take a look at my revised first page of the manual. So here's a star just to emphasize that if you piss off your customers with bad management, you won't get good reviews.
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