Pro-Oiler - Chain Oiler

Manufacturer's Description: The better way is the revolutionary PRO-OILER.

The PRO-OILER is the first and only system to give you continuous electronically metered and pumped lubrication - based on how far you have traveled.

Think about it:
The only thing that matters to your chain is the distance it's covered.
More distance = more oil... simple!

Pro-Oiler (typical layout)
Photo 1 of Pro-Oiler - Chain Oiler