Sound Off™ is an audio technology company based in New York City that specializes in manufacturing, selling, and renting wireless headphone systems. The company is known for its innovative silent disco events, headphone-based fitness classes, and other immersive audio experiences. Founded by Castel Valere-Couturier, Sound Off™ has expanded its offerings to include silent yoga sessions, conferences, and various live events. They generate revenue through the sale and rental of their proprietary wireless headphone systems, catering to both individual consumers and professional event organizers.