These are D-Tector digivice papercrafts, the Digivices used in Digimon Frontier, it's Japanese name comes from its notable function of scanning Fractal Code, based on the anime, manga and video games series Digimon, and the paper toys created by randyfivesix. There are eight different versions for Takuya Kanbara, Koji Minamoto, Tommy Himi, Zoe Orimoto, J.P. Shibayama and Koichi Kimura.
They received their D-Tectors when they were first brought to the Digital World; they were changed through Ophanimon's power from their cellphones. Koichi Kimura's came from Koji's Digivice when his resolution purified the Spirits of Darkness. When confronted with Cherubimon, Ophanimon used the last of her power to upgrade Takuya and Koji's D-Tectors to their second level, which allowed them to use Unified Spirit Evolution. The D-Tector allows the DigiDestined to use Spirit Evolution and Beast Spirit Evolution. It can be used to scan, purify, and then realize Fractal Code and Spirits. It can be used to talk to communicate with each other, the creator of the Digivice Ophanimon, or with the Spirits themselves. The D-Tector also has compass and radar functions.
You can download these papercraft toys here: Digimon - D-Tector Digivice Free Papercrafts Download [Takuya Kanbara & Koji Minamoto] [Takuya Kanbara & Tommy Himi] [Koji Minamoto & J.P. Shibayama] [Zoe Orimoto & Koichi Kimura]