A wearable tag is a small battery-powered radio device clipped to a worker's clothing, helmet or lanyard so that forklift-mounted units or fixed anchors can detect and range that person.
Wearable tags are what make tag-based pedestrian detection work. Each truck carries a unit that measures distance to nearby tags and warns the driver, the pedestrian or both when a tag enters a configured zone. Many tags also vibrate, beep or flash, so the person on foot gets a warning as well as the driver. Some include a button for help calls or a fall sensor for lone workers.
A tag only protects the person wearing it, and only while it is charged and worn correctly. That makes issue-and-return routines, charging racks at shift change, low-battery alerts and a plan for visitors and contractors part of the system, not an afterthought. Tag-based detection does not see people without tags, which is why some sites pair it with camera-based detection. When comparing tags, check battery life at the update rate the safety function needs, ruggedness, how alerts feel in a noisy area and what data the tag records about its wearer. The proximity detection page covers how tags and truck units interact.