You make a Strike with the weapon that the Device is attached to. If the strike deals damage, you gain +1 Bonus Die to your damage roll, and it deals Arcanite damage instead of Weapon damage. This ability counts as a (very temporary) Weapon Infusion effect, and does not function if you are already benefiting from a Weapon Infusion.
If the Device is loaded, you can use this ability in place of a melee weapon Strike granted by another ability.