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Product size: 2.7*3.5cm/1.06*1.37inch Product material: plastic 1. The finger calculator is small and light, easy to carry and store, so you can wear it at any time. 2. This ring counter has a simple and intuitive interface and is easy to use. You can check the quantity quickly and accurately. 3. Equipped with high-precision sensor. You can safely use your finger calculator without worrying about calculation problems. 4. Battery power supply. You can replace the battery at any time without worrying about running out of power. 5. It is made of high-quality materials, so you can count the rings with confidence because it is durable and reliable. With a watch strap, it can be conveniently worn on the thumb for operation and observation.
