The Pulsarlube OL500 oil lubricator consists of the main body with a vertical self-priming pump controlled by the microprocessor, a 500cc oil reservoir, and a battery pack. This product has the ability to precisely deliver very small amounts of lubricant with selectable intermittent dispensing cycle. The volume of output is adjustable from 0.70cc to 33.4cc/day, equivalent to the service period of Half month to 24months for the 500cc oil reservoir. It is available with up to 4 feeds by using optional installation kits. NOTE The Pulsarlube OL500 is a reusable unit but the battery pack must be replaced when each dispensing period set is complete.