[. . . ] The current speed is always displayed on the 4 digits set when riding. Be sure to press the All Clear (AC) key to clear all stored data and initiate the computer before using it or when replacing battery otherwise the unit may malfunction. [. . . ] To change the flickering digit, hold down the "MODE" button till the flickering digit moves to the next digit. Hold down the "MODE" button till (about 6 seconds) it jumps out the setting to store the desired data and complete clock setting. When the brightness of the LCD display is dim, it means that the battery is nearly exhausted. Replace with a new LR44 (Cross reference type A76, AG13 or V13GA) battery in the compartment on the back of the computer with the positive (+) pole toward the battery cap. The computer will automatically begin counting SPD, ODO, DS, MS, TRT, RT and AS data upon riding and stop counting data when riding is stopped. To preserve battery, this computer will automatically switch off when it has not been used for about 10 minutes. The power will be turned on automatically by riding the bicycle or by pressing the button. Quickly press this button to move in a loop sequence from one basic function screen to another. Press the ALL CLEAR (AC) key to initiate the computer or use ALL CLEAR if any irregular data appears. Hold down the "MODE" button till the LCD digit is blanked, then release it. Did you leave main unit under direct Place main unit in the shade to return to LCD is black sunlight when not riding the bike for normal state. This computer can be used in the rain but should not be used under water. [. . . ] To change the flickering digit, hold down the "MODE" button till the flickering digit moves to the next digit. Hold down the "MODE" button till (about 6 seconds) it jumps out the setting to store the desired data and complete clock setting. [. . . ]