Residential Safes Expandable Depth Wall Safe - 15W x 3-1/4-6D x 22-1/8HMfr #: 493492N Adjustable depth provides the ability to maximize the useable space when installed in different wall thicknesses Expandable shelves included to use with different depths Battery operated electronic lock. Mechanical override keys used to bypass the electronic lock due to dead batteries or lost code Pry resistant recessed door with concealed hinges for anti theft protection