From the Mfg's website located here: http://www.pontoonlegs.com/index.html

Quietly raise and lower pontoon legs with a touch of a button

This innovative lifting system enables pontoon boats to literally stand on their own four feet using nothing more than the power from a 12 volt battery. Whenever you pull into shore, on any type of bottom, you can raise your boat clear of the water in seconds with the touch of a button. Like conventional Hewitt Lifts, this made-to-go system helps protect your pontoon from the damaging effects of waves and water for longer service life and higher resale value.

Hewitt Electric Pontoon Legs are constructed from high-grade structural aluminum and solidly bolted to the frame members of your pontoon boat. The complete system adds only 385 lbs and has a load capacity of 6000 lbs. Maximum lift height is typically 5½' from the bottom of the legs to the underside of the boat deck, or 3½' to the bottom of the pontoons.

To have Hewitt Pontoon Legs installed on your boat, contact your dealer.

Features

All-electronic lifting mechanism. A powerful 12 volt DC motor coupled to an acme screw and nut is used to drive each heavy-duty frame leg module. This design provides a positive self-locking lift at any height.
4-way and independent position control. Allows quick extension and retraction of all four legs plus individual adjustment of any leg to easily level your boat.
Low-profile design. Legs extend less than 6½" below deck in their stowed position. Will not interfere with trailering or normal operation.
Large 11½" x 22½" tubular feet evenly distribute weight over a large area for solid footing on hard or soft bottoms. Feet pivot independently for added stability on rocky or uneven terrain.