I have never been big on security systems but with this bike I wanted something more than rotor locks. So I did a little research and a lot of reading and settled on HD's offerings. I went with the add on "Smart security" and siren/pager. The P/N's were as follows 68300-07A, "smart security module" which replaces the T/S module. 68328-06A, "Smart siren". 91660-06, pager. It took a couple trys but I finally have it up and running as advertized. My take on it is it will no doubt keep someone from pushing/carrying the bike off, or at least I will know it is in progress and they will be somewhat deaf. It will not keep a thief from stealing saddlebags or anything else attached to the bike, unless they first stand the bike up. For the $400 I have invested, not counting the gas to ride back and forth 3 times to the dealer, I feel it was a good investment. The pager range is actually better than HD claims. I hope to do a lot of, at least overnight, trips next summer so the peace of mind when in a hotel/motel will be well worth it.