The Dumas #3702 Sail Control Unit is a preassembled unit for sailboats up to 36 inches long and having 700 sq. in. or less of sail area. Both the jib and the mainsail are controlled simultaneously with the unit. Batteries not included. Measurements: 2"W x 2-3/4"H x 3-3/4"L Weight: 7 ounces Travel time: 3 seconds Torque: 24 lb/in.