Seiko Ultrak 310 6 Pack Great for students, volunteers, or other event timers, the Seiko Ultrak 310 6-Pack offers simple start, stop, and reset functions for easy use. This 6-pack of simple event timers measures up to 10 hours and records accurate times. The set offers six vibrant colors - purple, blue, red, orange, green, and yellow. Silent operation, no beep. Includes lanyard.