The completely self-contained, battery-powered DL2700 is easy to install because it uses the same door prep (mounting holes) as most standard cylindrical knob sets. It can be used as a keyed or keyless lock system with master key and unique master code capabilities.^^What???s Included?100 User CodesProgrammable KeypadPassage Function and Master/Management CodesOne-Time Emergency Access/Service CodeProgrammable Delay Entry (5 to 20 Seconds) or Key BypassNon-Handed, 12-Button Metal Keypad with New Clutch Mechanism2-3/4" Backset26D Dull Chrome Finish Low Battery" Alert^^More about This Lock^This electronic push-button access control lock is made to fit doors measuring 1-5/8" to 1-7/8" thick. It has an 8-1/4" x 3-1/4" cast aluminum body and runs off of five AA alkaline batteries.^^Certifications^Trilogy???s DL2700 Series has a three-hour UL fire-rated deadlatch. As a Grade 1 electronic push-button access control lock, it can be hardwired for relay output.^^Why Trilogy?^Trilogy models employ "Flex-Drive" motor locking. This locking technique means there are no mechanical chambers to replace or solenoids to bind.