Smartphone timing system. Designed to capture, store and display testing data for individuals and small groups for many applications. The Black Box system relies on the same radio and timing technology that powers Brower Timing System's TCi system. Timing data is displayed on a smartphone instead of the TCi Timer using a BLE connection. Smartphone is only used to view times and store memory. Great for timing the 40-yard dash, 5-20-5 L drill, combine testing and interval testing. Add up to 20 split beams for testing and custom applications.Ideal for track and field events but also designed to work with a multitude of sports.