Here's a pic of one I bought on Ebay a few years ago – around 30-40 bucks.
Pros:
- No keys to lose.
- Never need to carry a key around (good if you have no pockets and are carrying two beers – ahem, drinks).
- Automatically operates blower when engine is at idle or stopped.
- Can be easily locked with a custom code.
- No extra keys on a key ring to swing around and scratch stuff.
- Easy to install.
Cons:
- It's an eyesore. How easy would it have been to make it nicer looking?
- Two small holes for mounting screws.
- Having to explain to everyone that rides on the boat what it is.
- Having to explain to a new driver how to use it.
- It beeps when it turns the blower off prompting the inevitable, "What was that?"
Over all, I like it.
-Mike