This finger tally counter is for counting anything and everything you need with ease and simplicity. It can be used in laboratory, stadium to count the number of people, attendance, competition results, training activities, etc. The attributes of the finger tally counter is: Count Range: 0-99999; Overall Length: 107mm(4.21 inch); Belt Max. Diameter: 30mm(1.18 inch); Counter Size: 36x30x16mm(1.42x1.18x0.63 inch)(WxH) LED backlight display, you can see clearly at night.; Built-in AG10 battery, you do not need to buy another one. Wear the counter on your thumb or index finger, press once count once. There is a reset button on the left, press the button on the right to turn on the LED backlight. Please note that this counter is suitable for wearing on the finger(Max. Dia:30mm(1.18 inch), not the wrist.