The collar is a novel bio-wearable device capable of recording and tracking the entire process of estrus, feeding, fatigue, riding, shedding, rapid breathing, and rumination in cattle. The estrus monitoring system provides real-time statistical data on herd estrus data and health status. Through intelligent big data analysis, it offers functions such as estrus early warning for ranches, thereby significantly saving labor costs and achieving efficient management and improved breeding efficiency. The smart collar can be equipped with a dual-ring design (internationally compatible) or a date buckle. It also supports dual charging modes of magnetic charging and solar charging, and is reusable. The rechargeable battery can last for more than 4 years on a single charge, and the collar has a lifespan of over 8 years.