If the owner has installed a custom brake light system and does not want to change the taillight bulb that came with it, then this is the model to buy. Or perhaps you don’t know what type of bulb the bike uses if this is a gift. This universal system allows the installer to hard wire the transmitter directly to the tail light wires using the connectors supplied and hiding the transmitter under the seat or fender. For a more custom installation, the transmitter can be mounted in a location in which the driver can see the transmitter. It has a red LED which lights when the brakes are applied. In this way the driver can see that the system is operating. Either way, it is an easy installation which takes a little more effort than the other models, but easy none the less. Complete instructions make it fool proof.