iO-WW4 - Warning Watchdog™ Condensing Unit Alarm System Hardwired Warning Watchdog Logic Panel with Siren Cut-Off Timer and Siren Silence Switch The condensing unit alarm system sounds a loud siren and can also trigger a central alarm, phone dialer or other device. It can monitor up to 4 condensing units with one panel. This easy-to-install condensing unit alarm system can be used with packaged or split systems. It will alarm if refrigerant loss is detected, the disconnect is pulled or wiring is cut. Warranty: 1-year