These crystal lenses fit over the eyes. They have 3 charges. While wearing them, you can expend 1 or more charges to cast Charm Person (save DC 13). For 1 charge, you cast the level 1 version of the spell. You increase the spell’s level by one for each additional charge you expend. The lenses regain all expended charges daily at dawn.
RollQuest summary 3 charges/dawn. Cast Charm Person (save DC 13); 1 charge casts it at level 1, one level higher for each extra charge.
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.