This lamp from Konstsmide has an IP20 rating. This model should be used indoors, perfect if you're on the lookout for a new lamp.
From Wayfair
LED Fairy Lights String Light - brown (440.0 W cm)
Conrad Electronic
Konstsmide 1460-190 Holiday lights (mini) Inside battery-powered No. of bulbs 20 LED (monochrome) Warm white Illuminated length: 1.9 m