Usage Tips: COMPACT AND LIGHTWEIGHT: This digital hand tally counter measures 6.6 x 3.5 x 2cm and weighs about 20g, compact and lightweight, you can put it in your pocket and take it with you anywhere, so that you can start counting anytime. There is a lanyard on it, you can hang it on your neck or wrist, convenient to use and anti-lost. DURABLE QUALITY: The high quality ABS plastic outer shell of this counter is wear resistance and drop resistance, not easy to break,with high durability. It is powered by a LR44 button battery(included) which can provides long-lasting power more than 250 hours, can be used for a long time without changing the battery. EASY TO OPERATE: Press the on/off button turn on/off the clicker. When the counter is on, the screen will display "0". When counting, press "+" button to add a number one by one and press "-" button to subtract a number. If you want to reset the number to zero, you can long press on/ off button until the screen displays 0. CLEAR AND ACCURATE: This electronic manual clicker has a 4-digit LCD display screen, which can display the number from 0 to 9999 ( Not for negative numbers). You can counting numbers from 0-9999. When you add or subtract a number, the LCD screen will display it clear and accurate, no need to worry about counting wrong numbers. WIDE APPLICATION: This counter has a wide range of application and is suitable for all scenes that need to count numbers. You can use it at docks, warehouses to count goods, you can also use it to count the flow of people or cars at street and station;or you can use it at sports matches such as golf, football, swimming, running and rope jumping.