Digital Security Controls PRM-2W Polarity Reversal Module for 4 Wire Smoke Detect Interconnect

Hi, DIYers! Joe from AlarmGrid. And today we're going to talk about whether you should use a two-wire or a four-wire smoke detector. Today, I have a two-wire smoke detector, but the four-wire smoke detector of this particular model, looks exactly the same. And they do the same thing. So why use a two-wire or a four-wire? The main difference between the two-wire and the four-wire smoke detector is that one works with two-wires and one works with four-wires. A two-wire smoke detector has a pair of wires going back and connecting to the alarm system. These two wires handle power and data for the smoke detector. On a four-wire smoke detector, this is broken up. So one pair is going to be for the data connection, and one pair is going to be for the power connection. Either of these smoke detectors actually need their power to be cut when an alarm occurs so that they can reset. On a two-wire