Electronic Keyless Lock, Function Classroom with Key Override, Access Method Keypad, Mounting Style Mortise, Lock Material Zinc Alloy, Finish Satin Chrome, Series DL3500, Handle Type Lever, Door Thickness 1-3/8 in to 1-7/8 in, Key Override Options Standard SC1 Keyway, Hand Right, Outside Height 11 in, Outside Width 3 in, Outside Depth 3 in, Power Source (5) AA Batteries, Battery Life 100,000 Cycles, Operating Temp. Range -31 Degrees to 151 Degrees F, Max. User Codes 300, Fire Rating 3 hr