The FeverTags are a temperature detecting ear tag for cattle, each tag comes complete with a male post button. Install the FeverTags using most any two-piece universal pliers. The FeverTag is a pcb encapsulated strong polycarbonate plastic made to withstand harsh elements. Each Tag is weather resistant, and light weight. The feverTag is light weight (22.0 grams). The FeverTag will monitor every fifteen minutes, once pre-set temperature is breached an ultra-LED light will signal that the animal has high temperature.