Clicker counter is small, beautiful and accurate.contains 1 LR44 battery,With lanyardLong press "ON/OFF" for 3 seconds to turn on the counter,turn off the counter, when the screen displays "0", press and hold "ON/OFF" for 3 seconds to turn offAdd/Subtract Counter,Press the "+" button to increment one number at a time, "-"to decrement one number at a time,maximum value of the display is "9999",When the display is "0", press "-", it will become "9999"To switch off/on clicker sound. sustained hold the green or red button down for 3 seconds.Various scenes:, warehouses, stations, streets, ,widely used in point tally of people or , statistics of the number of vehicles in public , golf sports countingColour:BlackMaterial:ABSSize:5x4cmPackage Contents:2 * Counter ClickerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.