Came across Derrick Brew's Instagram and he posted a video of this LED pacer that caught my eyes and has also caught the eyes of many former and current Olympians, see the likes. In the video, it looks like it does a three command start for sprinters to work on the starts and then a pacer for the runner to chase down.
https://www.instagram.com/p/BmPaxmuFWQb/?utm_source=ig_web_copy_link