That's not a bad idea. Like Martey said, there are probably many similar things.
My advice would be to focus on technology (like you are doing) as much as possible. That is your niche and that might be why you are successful. (Speaking of success, how many units have you been able to sell to date and how long have you been operational?)
I would suggest marketing at technology events. Maybe walk person-to-person and hang out with people waiting to buy new iPhones. They would be glad to shell out the dough to make sure they do not lose their expensive new gadget.
Send some free samples to gadget bloggers. They might give you a plug and use it / discuss it in gadget blogger circles.
Good luck with it!
