4. c-type charging, lasting battery life, built-in 50mah rechargeable battery. 3. Oled display screen, showing the battery power and counting. 1. Portable ball counter makes counting easy. 2. Precise keys, accurate counting and long . 5. The ring has three adjustable gears, which is convenient and practical., Weight: 0.12786811196 Pounds, Manufacturer: Jeerylow