Turn off the lights and turn on the fun. FIREFLY glow in the dark rings will illuminate all your under the cover fun. FIREFLY couples ring is a playful and body safe TPE cock ring powered by a 3 speed, intense vibrations bullet. Suitable for all lubricants. (3 LR44 batteries included). Product Dimensions: 3.7 x 1.5 x 1.1. Purple. From NS Novelties.