The ULTRA II is compact, measuring 4 inches by 4 inches, and you can place up to three detectors in an operator that is activated by employing relay inputs. Uses a single power source for connection and there is input protection integrated into each device. Anytime you want to switch out to new devices or upgrade, it’s an easy process. Each of the three inputs has surge suppression and its own individual output. On the board is a 12-pin polarized connector where you will plug in your existing harness or wiring.