Dispel magic is only for spells. Unlike previous versions, dispel magic in 5e doesn't interrupt the functioning of permanent magic items at all though it can dispel the effect of a spell cast by a permanent magic item.

Can Dispel magic remove magic items?

Can you use dispel magic to dispel a magical effect like a vampire's Charm ability? ... It has no effect on a vampire's Charm ability or any other magical effect that isn't a spell. It also does nothing to the properties of a magic item. It can, however, end a spell cast from a magic item or from another source.

What can dispel magic remove?

Dispel Magic is instant, can be cast while running, cannot be interrupted and removes one debuff from enemy targets; Mass Dispel dispels one buff or debuff from each enemy or ally within the spell's area of effect, removing up to 20 effects in total, and can also remove immunities, but with a 1.5-second cast time is ...