NetBolt Smart Padlock, Metal Waterproof, Suitable for House Door, Suitcase, Backpack, Gym, Bike, Office, APP is Suitable for Android iOS, Support USB Charging (Gold) Tool Blades & Other Accessories Replaces any standard door knob Replaces any standard door knob Can be installed below an existing deadbolt** Installation requires no modification to doorFits doors up to 1 3 4" thickUnlocks with 1 or 2 user programmable codesCodes can contain up to 8 digitsCodes can be easily changed whenever necessaryIlluminated keypad Manual keyed emergency bypass (2 keys included) Latch adjustable from 2 3 8" or 2 3 4" (back set) Includes all required installation hardwareDesigned for interior or covered exterior locationsOperates approx Replaces any standard door knob Can be installed below an existing deadbolt**Installation requires no modification to door Fits doors up to 1 3 4" thickUnlocks with 1 or 2 user programmable codesCodes can contain up to 8 digits Codes can be easily changed whenever necessaryIlluminated keypad Manual keyed emergency bypass (2 keys included) Latch adjustable from 2 3 8" or 2 3 4" back set Includes all required installation hardwareDesigned for interior or covered exterior locationsOperates approx gym lockers based customer specialized can assist you with any pre sale and post sale services