I sent in an application (resume, cover letter) and was emailed by the CEO of the company. There was an in-person interview with the CEO, and I also met the Director of Sales and Director of Operations. The interview was 20-30 minutes long and consisted of typical questions about your resume, past experience, what you know about the company, and why you want to work there. Later, the CEO told me he had asked some other interns to pick up the phone and sell their product to a potential client/partner.