Features:1. The timer is completely waterproof2. Applied to all gasoline engines3. Inductive design, only need to tie the connecting wire to the spark plug to operate4. The large timing range is: 9999.9 hours5. LCD display6. Low voltage design, built-in battery power supply mode, safe and reliable7. The product is used in gasoline engines8.Set the speed mode at will, remind the maintenance function, and reset the system with one button Specifications:Product Name: Motorcycle Speed Timing TimerThe large timing range is: 9999.9 hoursLarge speed range: 9999RPMDisplay screen: LCD displayProduct size: 73.5*46.7*20Ordinary cars, mini cars, off-road vehicles, ordinary racing cars, mini racing cars, off-road racing cars, you can use it as you think of The package:1*Tachometer Notice: The picture shows the front and back sides of the product, the actual delivery is 1 Speed Mode SettingPress and hold the S1 button for 4 seconds, the RPM icon will display, and the LCD display will display 01 (ignite the spark plug 2 times per rotation); 02 (ignite once per rotation); 03 (other rotations); 04 (only display the time, not display Revolutions per minute).Once you have found your ideal spark plug ignition method, please release the S1 button, the LCD will flash for 8-10 seconds, and return to the total timing mode. The factory value is 02. Maintenance interval time settingPress and hold the S2 button for 4 seconds, the right half of the display will flash. And the SERVICE icon will be displayed. Press and hold the S1 button to automatically increase the number of flashing digits. After reaching the desired number, release the S1 button. Press and hold the S2 button for 1 second to add the next digit, and repeat the above steps until the interval time input is completed, unit: hour. Release all the keys, after 14-16 seconds, the LCD display will return to the total time mode. Confirmation of maintenance intervalPress the S1 and S2 buttons at the same time for 4 seconds, the two numbers will increase to 09 and then return to the total time mode. Indicate the maintenance interval time to confirm the start of work. When the service time of the engine start interval reaches 0, the SERVICE icon is displayed, indicating that the service time is up. To make the set interval time work, this step must be confirmed. Query the set interval timePress and hold the S2 button for 4 seconds, you can check your maintenance interval time without any settings. If you want to set a new maintenance interval, please repeat steps five and six. That is, if you want to check the maintenance interval time, just press and hold the S2 button. Processing after the service time is upAfter the engine is running, if the maintenance interval is up, the SERVICE icon will be displayed to remind the service. Press S1 and S2 at the same time to make the data from 01-09, the SERVICE icon will be turned off, the maintenance interval will automatically restore to the original set time, and continue to run. Only show timePress and hold the S1 button until 04 is displayed, then release the S1 button. After 8-10 seconds, the display returns to the total time. When the engine is running, the display will only display the time, not the speed, and the HOURS icon will flash. System ResetPress and hold the S1 button until 05 is displayed, release the S1 button, and the display will return to the total time after 8-10 seconds. Press and hold the S1 and S2 keys at the same time to make the data from 01-09, the system will reset, all data will be cleared, and the speed mode defaults to 02 Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.