The radio tracking headset was used to track the signal of the radio collars. It consisted of a handheld receiver and headphones. The headphones emitted beeping noises to direct the wearer to the collar. When looking for the Velociraptor nest on Isla Nublar, Alan Grant used the headset to track a juvenile raptor with a radio collar. The beeping of the headset directed Grant, as well as companions Robert Muldoon, Donald Gennaro, and Ellie Sattler, to the southern volcanic fields of the island. When the young raptor disappeared into the underground nest, the beeping stopped and Grant removed the headphones. As he did not take it into the nest, Alan Grant presumably left the headphones and receiver of the radio tracking headset next to the entrance of the nest.