- For use with AlertWerks sensor hubs as part of the AlertWerks environmental monitoring system. - Open/closed contact switch indicates Alarm or Normal. - The input voltage range of 0 to 5 VDC can be set through software. - Cable length is 15 feet (4.5 m). - Normally open; normally closed can be set through software. - Current Range: can sink up to 20 mA.