I would just check his feedback and see if anyone bought that kit off of him before.
I can't see what would be the problem, if any with this kit.
I am sure the alarm is a basic alarm with no special features. I am sure it does it's job.
Anyhow, good luck and do some research before you buy is the only advice I got for you.
I wouldn't go with a cheap power window kit, see if they will tell you the brand name on it
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DIY Clear 03+ Headlights