Stun Grenade (5e Equipment)
From D&D Wiki
Also known as flash grenades or flashbangs, these explosives produce a blinding flash and a deafening noise, overwhelming the senses without causing injury.
As an action, you can throw a stun grenade at a point up to 60 feet away. Each creature within 20 feet of an exploding stun grenade must make a DC 15 Dexterity saving throw or become blinded and deafened for 1 minute. A blinded or deafened creature can end these conditions by using its action to make a DC 15 Wisdom check to re-orient itself.
Cost: 35 gp
Weight: ½ lb.