4B Double O from Screaming O. Deep Rumbling Bass Vibrations. 5 speeds plus one pulse pattern bullet. Super-powered vibrating double ring. Reusable. Waterproof. Greener packaging solution from Screaming O. Re-sealable zip-top and made from eco-friendly, compostable materials. Featuring a new, better battery. New 4LR44 battery provides reliable and long-lasting power. Child-safe. Non-choking hazard.