RS232 and TCP/IP R2000 16 ports UHF RFID Module R2000 reader module JT-916, as a high efficiency and low cost, UHF  tag  reading/writing  module,  has independent Intellectual Property Rights. It works under the frequency from 860MHz-868MHz or 902MHz-928MHz. With 8dBi antenna,reading range can be reached 10m or longer. It is easy and fast to build an RFID system with simple power supply and interface.

Reading distance : 0-3cm; Working frequency : 13.56MHz; Support ISO14443A ISO15693 protocol.

High performance, flexible, low loss RFID Antenna Cables. 

Group reading >200 tags/sec; Reading range up to 0-25m;1-4 SMA antenna ports;

Each rfid animal ear tag is equipped with an RFID (radio frequency identification) chip, that transmits a signal. Antennas mounted on the feeding troughs will pick up that signal when the cow comes to feed, with a computer keeping track of the amount of time that elapses until the signal is lost when the cow leaves. In this way, the system can keep track of which cows are eating regularly, and that they're getting enough to eat when they do.