The wired unit both sends and receives an infrared beam. When an object crosses in front of the beam, it is reflected back to the unit and the unit beeps to signal that it is recording a time. The beam will reflect off of any object that is closer than 25 feet in front of the beam.
1. Make sure that there is nothing within 25 feet of the beam.
2. Make sure that there is a fresh 9volt battery. (Refer to instructions)
3. If the unit still is not working, it will need to be repaired.
- Place a cone 25 feet across from the beam to represent a finish line. This will keep people from passing to close to the unit and causing a false trigger.