NOTE: ONLY COUNTER. Not included and not included 1. 5 digit large-screen LCD display, large and clear 2. Use an ordinary AA Batery, no external power supply, and easy replacemen 3. Press the button to count press the button again, and resume counting 4. Input adopts ordinary contact simple and convenient to select accurate and reliable counting 5. The highest counting speed: 20 times/second, 1200 times 6. Clear: Panel/external use Technical Parameters: Power supply: 1.5V AA (For safe delivery, not included) Counting range: 0---99999 Counting the highest frequency: 20HZ Counting minimum width: 10mS Contact maximum resistance: 10K Contact disconnection minimum resistance: 500K Clear method: panel/external Clear the minimum width: 0.1 seconds temperature: -5--40C Dimensions: 64*38*38mm Opening size: 61*36 mm How to use: counting: Counting terminal input contact the counter starts counting. counting: Press the button to the counting; press the button again to resume counting. Clear the panel: Press RESET directly. External clear: clear the external contact of the terminal and clear it directly. Package include: 1 * Electronic Counter (Not included for safe delivery) _x000D_