Brower Timing System TC-Gate (photocell gates for start, split or finish). These Gates create an infrared beam that can start, split or stop the time. With the TC-System users can add up to nine splits. Includes one TC-Gate A, one TC-Gate B, and two Tripods. Photocell gates for start, split or finish. Includes one TC-Gate A, one TC-Gate B, and two Tripods.