Many times you walk away from your Prius and wonder if you have remembered to lock your doors. When you touch the lock button on your remote it is hard to see the headlights flash from a distance, especially in the daytime. Coastal Electronic Technologies, Inc. has developed a kit to enable a very quick beep out of the factory horn in your Prius whenever you lock the doors. This allows positive confirmation that your doors are in fact, locked. This can also be used as a method of identifying the location of your car in a crowded parking lot. The sound is very fast and quiet enough to be a pleasant reminder. We have grown quite fond of the little toot whenever we lock the doors! The kit comes with complete instructions along with color photos for each step. No soldering is required and no connections are made under the hood. The controller is completely assembled for you and the connectors on the three wires are already in place.