Suitable for most types of rallying, the Q-20 has all the features of the Q-10 with the addition of current and average speed functions. The current speed uses an advances algorithm that refreshes the display up to four times a second, ideal for high powered cars that accelerate quickly. The average speed function can operate to an accuracy of 0.1 kph/mph and is essential for regularity type events.The Q-20 requires a speed sensor for operation.A remote reset foot switch is also available to suit the Q-20 rally computer.Q-20 Features:Interval distance - average speedTotal distance - split / freezeAdjustable distances - counting up / downCurrent speed - remote reset x 1Dimensions: 102 x 56 x 20mmScreen Size: 2.8"Weight: 100gQ-20 Rally Computer User Manual