A. Rechargeable - The counter has a built-in rechargeable battery, eliminating the need for battery replacement and reducing mechanical issues. It can be used for 3 months on a single charge. B. Waterproof - With an IPX8 certification rating. The shell is made of ABS material with a sandy texture. The silicone ring is adjustable, offering more comfortable wear and reducing the likelihood of falling off. C. Functional features - The keys are silent and designed for long service life. It has 6 channels to record different information, with each channel having a counting range of 0 ~ 999999. It supports inverted display. The full-screen LED backlight enables use even at night. D. Wide range of uses - Suitable for various counting needs such as statistics, sports, scoring, knitting, and crocheting. It can be used in settings like schools, laboratories, golf, casinos, bars, prayers, and airplanes.