Type: P11-5AMagnetic Induction Digital Electronic Counter Instruction Five-digit big LCD, super low consumption, and clear indication Press Counting/Pause key (Pause) to stop counting, after 0-30 sec,LCD indication will be automatically off and in standby state. Press the Counting/Pause key again to turn on the indication and continue to count. Use magnetic induction, precise counting Maximum counting speed: 20 times per second Reset: through pressing the Reset buttons on board or exterior Use the common 5th battery, free from external supply Anti-vibration, stable and reliable system operation Free from mechanical abrasion, long lifespan: 1.5V-AA 5th battery Reset modes: board/exterior Counting range: 0---99999 Available ambient temperature: -5-40 Celsius Minimum counting PW: 10mS Distance within the magnetic induction: about 5-10 mm Distance out of the magnetic induction: 30mm Battery Installation: Make the battery is loaded before operation. First loosen two exterior screws on the external cover, remove the back cover lightly (do not break the signal line),then load one 5th battery (not included in this counter, customer should buy it by themselves,the lifespan of common 5th battery is above half year,while the battery with high performance, costing 2 Yuan, is more than 1 and half years,and restore the back cover and two external screws. Colour:White Material:Plastic + Metal Size: Dimension: 64x38x38mm Hole size: 61x36 mm Package Contents: 1 x digital counter 1 x magnetic induction switch 1 x holder