SECO-LARM SK-1123-FDQ 12/24V Vandal Resistant Flush-Mount Access Control Keypad

Interlocking input for connecting to a second keypad. Output- Tamper: 50mA@24VDC. Door sensor input for anti-tailgating operation. Duress code signals a silent alarm if an authorized user is forced to open the door under duress.

eBay