This unique, vibrating G-string is designed for incredible mutual pleasure during lovemaking. The thong is completely waterproof so you can enjoy it anywhere. The beads reside on both sides of the labia, giving you extra sensitivity while providing him with an incredible shaft massage as he penetrates during intercourse. The thong is adjustable to give you the proper tension hence one size fits most. The 1.875" x .5" removable micro-massager fits snuggly into a rubber loop just above the beads allowing the entire thong to vibrate. The micro-massager requires 4 watch size batteries, included, to provide ultimate power. A thong you will both love!