Electronic Keyless Lock, Function Classroom/ Storeroom, Access Method Keypad, Mounting Style Cylindrical, Lock Material Metal, Finish Satin Chrome, Series CO100, Handle Type Lever, Door Thickness 1-3/4 in, Key Override Options Interchangeable Core, Hand Field Reversible, Outside Height 9 15/32 in, Outside Width 3 29/64 in, Outside Depth 3 1/16 in, Keypad Material Rubber, Power Source (4) AA Batteries, Battery Life 1 to 2 yr, Operating Temp. Range -31 Degrees to 151 Degrees F