This little uxcell finger counter is one of those simple but super useful tools that you didn't know you needed until you have it. It's a light green plastic digital counter that fits right on your finger, with an adjustable band that fits finger sizes from about 2 to 3.5 inches around. The counter goes from 0 all the way up to 99999, which is plenty for most counting tasks. There's a counting button you press with your thumb and a reset button built right in. It's powered by one AG10 button battery (just FYI, the battery isn't included, so you'll need to grab one separately). The whole unit is pretty small - about 1.5x1x0.5 inches - and only weighs 16 grams, so you'll barely notice it on your finger. People use these for all sorts of things: counting inventory in warehouses, keeping track of people at events, tallying scores at sports games, counting products in manufacturing, you name it. It's way more convenient than trying to keep count in your head or with pen and paper, especially when you need to move around. The clear band keeps it secure but comfortable. Definitely one of those 'why didn't I get one of these sooner' kind of tools for anyone who needs to count things regularly.