This row counter uses magnetic induction, easy to install and accurate counting This electronic counter press Counting or Pause key to stop counting, after 0-30 sec, LCD indication will be automatically off and in standby state. Press the Counting or Pause key again to turn on the indication and continue to count This clicker counter with shockproof design efficiently ensure the stable and reliable system operation, free from mechanical abrasion This digital counter is made of plastic ,which is sturdy and durable,safe and long lifespan This number clicker counter use the common AA battery, free from external power supply This digital counter is made of plastic ,which is sturdy and durable,safe and long lifespan The working temperature of the magnet should be within 70 degrees Too high temperature will make the magnet lose its magnetism and further make the induction invalid Five-digit LCD display, ultra-low power consumption, large and clear display. Features Digital counter -Color: As Shown. -Material: Plastic. -Size: Hole Size:2.5x1.4 Inch. Power supply: 1.5V-AA battery (not included). Usable ambient temperature: -5 to 40C. Magnetic induction range: about 5-10 mm. Maximum counting speed: 20 times per second. Note: 1.The digital counter is not shipped with battery. 2.Due to the different lighting and screen settings, the product color may be slightly different from the picture. 3.Due to different manual measurement methods, please allow slight size differences. Package Including 1 x Digital Counter 1 x Proximity Switch 1 x Mounting Bracket 1 x Magnet