Wand of Fireballs

Requires attunement by a spellcaster.
{t}: Cast the fireball spell as an action. For 1
charge, you cast the 3rd-level version of the spell.
You can increase the spell slot level by one for
each additional charge you expend. The wand has
7 charges.
The wand regains 1d6 + 1 expended charges daily
at dawn.