Flashlight Black Body

Bicycle problem. Knog Boomer headlight not working?!?
I can't switch it on. Tried pressing the button [and also pressing and holding] but it didn't work. Even worse, I can't find anything resembling a battery compartment on it and I don't dare disassemble it via the flashlight component because it looks like I might just break it by doing so. How?!?
http://beta.aebike.com/Knog-Boomer-Twinpack-FrontRear-Black-Bodies_p_16704.html#
It's most likely the batteries need replacing, it takes 2 AAA size batteries.
There should have been some instructions with it showing how to replace the batteries, either in the pack, or actually printed on the pack.
The web site isn't very helpful (with Cateye, you can download manuals and instructions), but looking at the photo,I'd say that you have to remove the lens to replace the batteries.
If you can't figure it out, and have lost the instructions, try at the shop you bought it from, they should be able to help, or at least have another light with the instructions,
Good luck.
EDIT: Almost forgot, if it's not the batteries, then it's probably a fault, and the shop should either repace it, or send it back for repair.
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