Have a customer service number or chat support
What about display a customer service or chat support on your website. Do you know the customer service is the most important part on a product? I was looking to buy your product and I'm unable to see who to call for questions, I cannot imagine what would happen if something does not work.
Go to the US Zappiti site if you're in the US. The number is there.
Their response time to emails is pretty quick. Even this weekend I received a response within 4 hours of submitting an issue. On Christmas holiday long weekend, I think that's pretty damn good.