Digivice
The Digivice is the original device used by the season 1 digidestined.
It helped the digimon digivolve into their Champion levels.With the use
of the tags and crests, the digivice helped the Digimon digivolve into their Ultimate and Mega leves.
Tag and Crest
The Tag and Crest help Digimon digivolve into their Ultimate and Mega levels.
Each digidestined has their own crest which reflects on their personality.
Black Gear
The black gear was created by Devimon. The black gears were planted into random
Digimon and they became controlled by Devimon.