How do I program my Optex Chime?

Programming
1. To access the program mode press and hold switch one until Green
LED flashes.
2. Select the zone number by pressing switch two until desired zone LED
is flashing. All 3 zones flashing indicates zone 4 is ready to be programmed.
3. Activate the TD-20 Transmitter that will be assigned to the selected
zone. A programmed zone will display a solid LED.
4. Repeat steps two and three for additional transmitters. (Maximum of 4 per zone)
5. Press switch 2 until the green LED is on. This will exit you from the
program.