Electronic Keyless Lock, Function Entry with Key Override, Access Method Keypad, Mounting Style Cylindrical, Lock Material Zinc Alloy, Finish Satin Chrome, Series DL4100, Handle Type Lever, Door Thickness 1-3/8 in to 1-7/8 in, Key Override Options Standard SC1 Keyway, Hand Nonhanded, Outside Height 8 in, Outside Width 3 1/4 in, Outside Depth 1 7/8 in, Keypad Material Metal, Power Source (5) AA Batteries, Battery Life 60,000 Cycles, Operating Temp. Range -31 Degrees to 151 Degrees F Material Zinc Alloy Color Chrome Finish Satin Chrome Includes Software CD Standards BHMA Grade 1, UL Listed Series DL4100 Voltage 5.5-9 VDC