Turns pumps on and off automatically. Fully adjustable timer. 10 amp fully waterproof circuitry. Handles high capacity pump current draw. Requires a 3″ diameter round hole or a 2-1/2″ square hole for mounting. Auto Spray (On) Time – Approximately 45 Seconds. Auto Delay (Off) Time – 1 minute to 10 minutes (maximum). Front panel is 3-1/4″ x 3-1/4″ and requires only 3″ behind panel.