CL2255 Knob Operated. The CL2255 is a medium duty electronic lock. The outside knob turns freely without operating the latchbolt. When a valid code is entered and the blue LED lights burn, the knob will retract the latchbolt. When the door closes the spring latch will automatically lock the door. The key will open the door for management functions. Code Free Mode can be programmed at the keypad using the Master Code. Clean by Codelocks is an optional finish available to special order on many Codelock products. The clear coating combats SARS-CoV-2 coronavirus (COVID-19) and can reduce bacterial growth by 99.96%*, providing an additional measure of protection over sanitisation. Clean by Codelocks features an ISO certified photocatalytic coating which offers enhanced protection against viruses, bacteria, germs and other environmental toxins. For full details please view the data sheet in the associated documents or to order please contact our Specials Department.. Rapid Retrofit for basic single code mechanical codelocks. Tubular Mortice Latch. On door programming via Master Codes in seconds. Codes may be 4, 5 or 6 digits long