The Duo ULTRA is a reusable TPE vibrating ring with two 3-speed removable bullets. The thicker band constricts blood flow by keeping the blood in the shaft of the penis. The user will maintain a firmer and fuller erection during sex. The added pleasure knobs help provide a tighter and more secure fit for him, while the pleasure ticklers provide maximum stimulation for her. The specially designed, thicker vibrating head is the perfect size to ensure clitoral stimulation. Use as a vibrating ring or remove bullets for direct stimulation. Requires 3 AG13 batteries for each bullet, included.