Here's a link to their website with the number listed for customer service... It's one of the windows I've got open right now as a reminder because I've got to call them Monday morning as well; I won a bow with an HHA sight that I just put on one of my Guardians, but I don't have any instructions with it. I'd like to know if there's any features on it that I'm not utilizing... I will say this about it: it's the brightest sight I've ever seen!

http://www.hhasports.com/faq/index.htm