The desired set speed is adjusted up by momentarily depressing the RES/ACCEL switch. This is the TAP UP feature. To be considered a valid TAP UP request, the RES/ACCEL switch must be pressed between 0.06 and 1 second. Pressing the RES/ACCEL switch longer than 0.7 seconds will be considered an accelerate command. Each press of the RES/ACCEL switch (which is determined to be a valid TAP UP request) will cause the desired set speed to be increased by one mile per hour. Holding the RES/ACCEL longer than 1.4 seconds results in a new set speed upon release of the button.