Features: Large color screen: Full screen bright light is clearly visible, with bright colors. Multiple modes to showcase personality: four different styles of numbers to meet individual pursuits. Intelligent APP, always under control: Intelligent APP link, real-time synchronization, always under control. Adjustable size: The rings can be adjusted in three levels. Convenient and practical (18mm for 1st gear, 20mm for 2nd gear, 22mm for 3rd gear). Lightweight and portable: Designed to be small and compact, lightweight and comfortable, it fits snugly without any discomfort, and feels comfortable to wear without any foreign objects. Specifications: Component: ABS metal Color: white, black, green, pink Size: 18mm/0.7in in 1st gear, 20mm/0.78in in 2nd gear, 22mm/0.86in in 3rd gear(three gear adjustable) Counting ranges: 99999 Input: 3.7V Package Includes: 1Pc Digital Counter note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.