The new Device classification introduced in Magical Girl Lyrical Nanoha ViVid assigns Devices to three categories, according to how they are handled by their masters: Weapon-type, Wearable-type, and Auxiliary control-type.
Weapon-type (武器型 Buki Kata) Devices are wielded like proper weapons in combat. They were the earliest type to appear in the Nanoha series (Raising Heart).
Wearable-type (装着型 Sōchaku Kata) Devices are worn on the body like pieces of clothing or armor. Some translations refer to them as "Armored Devices". They were the second type to appear in the series (Klarwind).
Auxiliary control-type (補助制御型 Hojo Seigyo Kata) Devices merely enhance their master's magic without being used in combat directly. They are known as "assist and control type" in some translations. All Unison Devices and Stroseks belong to this type by default. They were the latest type to appear in the Nanoha series (Book of Darkness/Reinforce).