got this for $3 with batteries in it......it works....decent quality, similar to the MX-99U series....I couldnt find information on it other than airsoft or online sales from China....so my question is, is this a commercial item, PX item, or part of a small kit?? its got 4 filters in addition to the normal lens...a red, blue, yellow, and neon green...would like to know if my $3 was well spent