Ultrak 310 Event Timers - Set of 6 Set includes 1 one of each of the following colors: red, yellow, blue, green, orange and purple The Ultrak 310 is a simple event timer that is ideal for students, volunteers and other occasional timers! All other entry-level stopwatches include a mode that takes users out of the stopwatch function and into time, date, alarm, etc. This has the potential for throwing those who seldom use a stopwatch for a loop, particularly event volunteers