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) from 1963 through 1977. 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. Now you can add intermittent wipers to your classic GM car or truck. The addition of this module gives three intermittent delay options to the factory slow and fast speeds. Uses the stock switch and motor for a totally stock appearance. Installs between the switch and factory harness. The factory switch operation is changed from a mode selector to a mode sequencer allowing the user to sequence up or down through six modes (off, 1 wipe every 8 seconds, 1 wipe every 5 seconds, 1 wipe every three seconds, continuous slow, and continuous fast).