The original remote transmitter used on CoolStart RS-900 models is Remotes Unlimited part number 772-1772. This keyfob is no longer made and we no longer have it in stock. However, CrimeStopper does make a replacement remote for it, which is RUI part 071-6497. It supports all of the same functions but has no flashlight on it. You can see both parts and purchase the new replacement part at the following link:
RUI Parts 772-1772 and 071-6497
Purchased parts come with programming instructions and free phone technical support if you run into any challenges. We sell a lot of these parts and our tech support staff is very knowledgeable about how to program them if you need help.