Countdown timer used at all championship meets throughout the world. Choose from single or double sided. Countdown timer has various pre-programmed times. Also used as an elapsed time clock for CC, road races and the track. Countdown can be set for durations up to 99 minutes. Anti-glare 6â€ x 3â€ digits with rain resistant casing. Includes tripod, 120V adapter plug and 12V internal battery. External battery can be connected if needed. Connect to Gill Ultrasonic Wind Gauge to display wing reading continuously or 10 second intervals.