This row counter uses magnetic induction, easy to install accurate counting This electronic counter press Counting/Pause key to stop counting, after 0-30 sec, LCD indication will be automatically off in stby state. Press the Counting/Pause key again to turn on the indication continue to count This clicker counter with shockproof design efficiently ensure the stable reliable system operation, free from mechanical abrasion This digital counter is made of plastic ,which is sturdy durable,safe 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 durable,safe long lifespan; The wking temperature of the magnet should be within 70 degrees;Too high temperature will make the magnet lose its magnetism further make the induction invalid; Five-digit LCD display, ultra-low power consumption, large clear display. Features Digital counter -Col: 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 screen settings, the product col may be slightly different from the picture. 3.Due to different manual measurement methods, please allow slight size differences. Package Including 1 Digital Counter 1 Proximity Switch 1 Mounting Bracket 1 Magnet