Manufacturer Schlage Model L283-086 Lock Functions L9082EU – Electrically Unlocked Both Sides. EU: Outside and inside knob/lever unlocked electrically. Latchbolt retracted by key either side. Switch or power failure keeps inside and outside knob/ lever locked. Auxiliary latch deadlocks latchbolt when door is closed. (Previously XL11-452) Operating Voltage 24VAC or 24VDC Mode of Operation Fail Secure Operating Temperature Maximum +151 F, minimum -31 F ANSI/BHMA A156.13 Series 1000, Grade 1 U.L. Listed UL Listed Warranty 1 Year Warranty Weight 3.0000