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All the Season 2 Digivices {D-3 Digital Detect and Discover} (Pic 1 Davis, Kari, Yolei, TK, Cody + Ken, Pic 2 Ken + Davis D-3's combined, Pic 3 Kari + Yolei D-3's combined, Pic 4 Tk + Cody's D-3's combined

Digieggs for Armour Digivolving, Top Row: Courage + Friendship + Miracles (Davis), Love + Sincerity (Yolei), Knowledge + Reliability (Cody), ),
Row 2: Hope (TK) Light (Kari), Kindenss (Ken), Fate (Willis), Darkness (Cards only could be Emperors)

The D-Terminal is how the kids keep in contact with each other. It also stores the 02 kids DigiEggs.
The Dark Ring was made fo enslave Digimon by Ken as the Emperor. Myotismon explained that it was based on Gatomon's tail ring. It could only control up to champions and for a v short time Ultimates but they kept breaking free.
The Dark Spiral is the next stage of the Dark Rings. It can control Ultimate Digimon as it has more power!
The Control Spire/Dark Towers have many uses. The first was to keep 'ringed' digimon enslaved, stop Digimon from normally digivolving (as well as Ken's Digivice), They were used by Arukenimon to create Digimon with her spirit needle. And finally Myotismon revealed their true meaning...to weaken the bounderies of the Digital World so he could re-enter and become king of both worlds