Revolution Electronics Intermittent Wiper Module for Classic GM Vehicles Upgrades classic GM vehicles to include three intermittent wiper delays to the stock slow and fast speed options. Utilizes the stock two speed switch and motor for a totally stock appearance Designed to work with GM two-speed, non-hiding wipers (rectangular wiper motor). Will not work with hiding (recessed park) wiper motors (round wiper motor). Designed to work with dash-mounted switches. Not intended for column mounted wiper switches. For 12V vehicles. 4 by 2 by 1 inches. Fully potted. Made in USA.