Looking down on the circuit board, identify the four small switches. The switches may be set to the desired "mode", (left or right) as follows:
The SOS II now has it all in a single small package.
Here are a few advantages with no change in price.
All gate operators use low voltage for their electronic controls. (AC or DC) and this can also be used as your SOS power source. If unfamiliar, use a long 4 conductor cable (24 gauge stranded) for testing, thereby allowing options for the best permanent mounting location. Some installers mount the SOS inside their larger gate control box, but just be sure the "Yelp" sound can reach it without distortions. CAUTION: If mounting the SOS onto metal, do not allow drilled metal pieces to collect onto the magnetic field that is present around the back side of the microphone. Locate the SOS inside the fence!! In higher security installations, one may wish to place it high and out of reach, and/or at some farther distance away. Since the sensitivity and location of the SOS is variable, one can require a high volume of "Yelp" sound. This would thwart pernicious or "sneaky" attempts to open the gate. While deciding on the best permanent mounting location for the SOS, remember that the omni directional microphone should be facing down. Mounting holes are located in the four corners inside box, drop screw inside of the indentures, but outside of the weather seal, screws provided. If you must drill into the back of the SOS enclosure, do so through either of the two raised portions (left or right) of the mic sponge using the same size hole. Get a tight fit and seal out moisture. Moisture damage will negate warranty.
Press clear down on orange lever to connect wires. Connect 9 to 30 VAC or DC to the + or -. Polarity does not matter. The amber light will slowly blink. Connect the two relay wires from the OPEN-gate terminals into sw 1 or sw2.
To test for a proper gate hookup, touch a jumper between the NO and COM (there are two) they are SW 1 & SW 2. This should trigger the gate to open, as if by the SOS relay closure. The "Yelp" tape provided and used with the player held close to the mic, will trigger the relay closure & flash a green LED within 2.5 seconds. If the "mode" switch is pushed away from #1 the SOS will respond to the YELP, WAIL, or HI LO within 2.5 seconds. The DT (decibel time) 6 seconds.
The sensitivity is factory set at "normal". Full sensitivity (clockwise) is seldom needed. If the vehicle is using a "Yelp" sound similar to the demo tape the amber light should come on steadily, and the relay will close in 2.5 seconds or less. If the amber light does not come on steadily, advance the sensitivity and test again.