Description Electronic Keyless Lock, Function Classroom with Key Override, Access Method Proximity, 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 Left, Outside Height 11 in, Outside Width 3 in, Outside Depth 3 in, Keypad Material Metal, Power Source (5) AA Batteries, Battery Life 75,000 Cycles, Operating Temp. Range -31 Degrees to 151 Degrees F, Max. User Codes 300 Material Zinc Alloy Color Chrome Finish Satin Chrome Includes Software CD Standards UL Listed Series DL3500 For use with ALPCI2-U, Mfr. No. AL-DTMIII Voltage 5.5-9 VDC