Not to be confused with the first game's version, the Ukulele.
The Ukulele is a returning Uncommon item in Risk of Rain 2. Each attack has a 25% chance to hit up to 3 enemies within 20 meters with lighting for 80% damage. Each stack increases the max amount of targets by two and the range by two meters.
Additional stacks of this item do not increase the chance to trigger, nor the damage, only the number of targets hit and a small boost to the effective range. Picking up additional Ukuleles is only recommended over other Uncommon items if you have enough on-hit effects. This is due to the lightning's proc coefficient of 0.2.
Visually the Ukulele is shown on the characters back, over the right shoulder blade, and on the rear right side of Auto-Turrets.