This is an optional handle for the 740A and 740R LED Personal Safety Lights. Installation of this handle is as simple as removing the magnetic battery cover and screwing this handle on in its place. Handle includes new O-ring for watertight seal. The shaft of this handle is designed to fit into most standard size traffic cones allowing for advanced warning in emergency situations. Installing this base does not affect the ability to hang light with the lanyard. However for magnetic operation simply switch the base to the magnetic one.