The Digivice (デジヴァイス, Dejivaisu?), short for "Digital Device", is a device from the Digimon series based on the first Digimon product, the Digimon Virtual Pet, and it indicates that the possessor is a DigiDestined. It appears in every season of the anime, as well as the V-Tamer 01, Chronicle, D-Cyber, and Next manga, and several of the video games. Its primary use is to empower the DigiDestined's partner Digimon through Digivolution, though each version of the Digivice is also equipped with many other helpful features, such as radar or data storage. Even when Digivices are the same type, they are usually differentiated by a color scheme unique to the character who uses them.

https://digimon.fandom.com/wiki/Digivice
Digivice デジヴァイス