Features: The belt is adjustable, and it can be fixed on your finger for easy to operate. New style electronic counter with backlights, sensitive buttons, accurate word movement. Perfect for teachers, engineers, lab technicians, and athletes who require accurate multi channel counting capabilities for various tasks. Whether in classrooms, laboratories, constructions site, or sport training, this versatile counter ring offer a convenient solution for all your data recording and statistical needs. The adjustable ring belt ensures a comfortable fit for any finger size, making it easy to carry and use on the go, while the upgraded button provides a satisfying tactile response during use. Specifications: Material:ABS Color:Redness,Yellow,Green,Color1,Black,White Package Includes: 1Piece Electronic Finger Counter note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.