Manufacturer Schlage Model L283-085 Lock Functions L9082EL – Electrically Locked Both Sides. EL: Outside and inside knob or lever continually locked electrically. Latchbolt retracted by key either side. Switch or power failure allows outside and inside knob/lever to retract latchbolt. Auxiliary latch deadlocks latchbolt when door is closed. Operating Voltage 24VAC or 24VDC Mode of Operation Fail Safe 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