We are the manufacturer of Sensaphone products, and they can be purchased directly from us. Sensaphone products are also sold through a network of distributors and resellers with expertise in a variety of applications. Please contact us so that we can help you to find the best source for your Sensaphone needs and the right product for your application. Call us TOLL FREE at 877-373-2700 or just send us a quick e-mail at sales@sensaphone.com