HCC22/25/27 series animal ear tag coil with EM4305 chip is a low-frequency 134.2 kHz hollow induction coil, specifically designed for RFID animal identification applications. It is widely used in pig and cattle electronic ear tags, providing stable signal performance and reliable communication with LF RFID readers.The coil is optimized to work with EM4305 RFID chips, ensuring consistent read/write performance, high sensitivity, and long service life. Its hollow coil structure allows easy encapsulation into plastic or TPU ear tag housings, making it suitable for large-scale automated production, this coil is ideal for livestock management, breeding tracking, epidemic prevention, and animal traceability systems.