Equipped with patented expandable wings makes for a no-tool and no-stress installation. The iKeyp Pro provides peace of mind by bringing security, technology and access together. Batteries Required: 4 x AA Alkaline (not included). Exterior Dimensions (wings retracted): 6.0″h x 12.8″w x 3.4″d. Exterior Dimensions (wings fully extended): 6.0″h x 22.6″w x 3.4″d. Interior Dimensions (wings retracted): 4.6″h x 8.4″w x 2.5″d.