"He has the device."
Translation:Er hat das Gerät.
Masculine nouns change the article der into den in Accusative case. Neuter nouns don't change in Accusative.
Er hat das Gerät. Er hat den Wagen.
'Der Gerät' is a funny meme. If you say Der Gerät instead of das Gerät you will be made fun of
"He has the device." This sounds like it's the Continuum Transfunctioner. I speak German as my mother tongue and had no idea how to go about translating that one.