Annoying Ring of Concentrated Light

A red ring with 4 small crystalized prongs that taper to a point in the center. The crystals have small amounts of magical energy in each.
Use the ring for pointing stuff out, distracting guards, or blinding bandits!

As a bonus action, the user can press a button located on the side of the ring to activate it. 
Activating the ring shoots a visible red laser roughly 60ft.
When pointed at a creatures eyes, the creature must succeed on a (DC11) Constitution save or be blinded for 18 seconds (or until they pass the save on their next turn).
Creatures with sunlight sensitivity have disadvantage to the save.
Creatures in a dark area, or room have disadvantage to the save (dark vision and true sight negate this effect)
The ring has 6 charges, and can regain 1d4 per short rest.
The ring fully fills at dawn.