COMPACT AND LIGHTWEIGHT: This digital hand counter measures 6.6 x 3.5 x 2 cm and weighs about 20 grams, so small and lightweight that you can put it in your pocket and take it with you so you can start counting anytime. There is a lanyard on it, you can hang it around your neck or wrist, easy to use and prevents loss. DURABLE QUALITY: This counter is made of a high-quality ABS plastic shell, which is wear-resistant and drop-proof, not easy to break, and durable for a long time. It is powered by an LR44 button battery (battery not included), which provides over 250 hours of long-lasting power, allowing you to use it for a long time without changing batteries. EASY TO USE: Press the on/off button to turn the clickers on/off. When the counter is on, the screen will display "0". When counting, press the "+" key to add a number and press the "-" key to subtract a number. If you want to reset the number to zero, you can long-press the on/off button until the screen displays 0. CLEAR AND ACCURATE: This electronic manual clicker features a 4-digit LCD display that can show numbers from 0 to 9999 (not for negative numbers). You can count numbers from 0-9999. When adding or subtracting numbers, the LCD screen is clear and accurate, so you don't have to worry about counting the wrong numbers. WIDE APPLICATION: The counter has a wide range of applications, suitable for any scenario that needs to count numbers. It can be used to count goods in ports and warehouses, and can also be used to count people and vehicles on streets and stations; it can also be used at sports events such as golf, football, swimming, running, and jump rope.