THIS LISTING IS FOR 24V 2-second CALL Delay. Single Programmable relay offers four selectable modes of operation: True Presence (Infinite) - Factory Set, Limited Presence, Pulse on Entry, Pulse on Exit, 4 loop frequencies selectable from front panel. 4 sensitivity levels selectable from front panel. Super bright LEDs provide separate Power, Detect, and Loop Fail indications. 11-pin Rear Amphenolö connector. Fail-Safe and Fail-Secure versions available. Configurations available: 24 VAC, 120 VAC, 240 VAC, 12 VDC, 24 VDC -- THIS LISTING IS FOR 24V