|This is such a small alarm unit it can be hidden almost anywhere on the bike. The siren is ear percingly loud for such a small unit. I upgraded one of the remotes to the ignition key type which you put the metal key part into the remote making what looks like a factory remote control, very cool. Its Thatcham approved to boot (upgrade apparantly) and it also has battery backed up siren and an immobiliser circuit. This is a brilliant bit of kit. Highly recomended.