Solid Black CL5020 BK DND. The Codelocks CL5020 DND is a heavy-duty electronic push-button lock designed for commercial and hospitality applications, featuring a stainless steel keypad and key override. It offers full programming control via the keypad, allowing up to 80 user codes and a mortice sash lock for secure access. The lock supports a passage mode for unrestricted entry and has a "Do Not Disturb" (DND) function that prevents code entry when activated from the inside. Powered by four AA batteries, the CL5010 DND provides low-battery warnings and retains programming during battery replacement. DND is enabled by pressing the red button on the inside and is cancelled by pressing the blue button or by turning the inside lever handle. When do not disturb is activated, only the Master and Sub-Master codes can unlock the door, ensuring no interruptions or unwanted access. If a standard user code is entered, the lock LEDs will flash, an alert will beep and the door remains securely locked. The DND mode can be overridden with the master/Sub-Master code or the override key. 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.. Netcode technology. DND (Do Not Disturb) function. Suitable for heavy duty use. Passage function