Product name:Finger Counter(Random color) Product Size about:2.7*3.5cm/1.06*1.37in Product color: As shown in the figure Battery: RC2032(260mah) Product Material:ABS product features: 1. The finger calculator is small and lightweight, easy to carry and store, and can be worn at any time. 2. 2. The interface of the finger calculator is simple, intuitive and easy to use. You can use it to record your exercise, it has a wide range of uses you can imagine. 3. Equipped with high precision sensor. You can rest assured that you can use the calculator to make calculations. 4. Battery powered. You can replace the battery at any time without worrying about running out of power. 5. Made of high quality material, durable and reliable, you can count the with confidence. Equipped with a strap, you can easily wear it on your thumb for operation and observation. Precautions: 1. As we know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can feel to contact mewe will give you some suggestion, but it is for you reference only. Shipment includes: 1 pc Finger Counter(Random color)