Necklace Of Fireballs

This necklace has 1d6+3 beads hanging from it. You can use an action to detach a bead and throw it up to 60 feet away, where it detonates as a 3rd-level Fireball (PHB, p. 241) spell (spell save DC 15).
You can hurl multiple beads as one action. Increase the level of the Fireball by 1 for each bead beyond the first.