Kyocera is introducing a Bluetooth rearview mirror for your car. Designed to fit over your existing mirror, Kyocera's product will pair with your Bluetooth phone when you're driving. When your phone rings, the caller's number will flash on the mirror, so you won't have to fumble for your phone to see who is calling. Although Kyocera is promoting the product as a hands-free way to use your phone, I'm a bit skeptical. You'll still have to take your eyes off the road to see the mirror, and what good is a rearview mirror if it's covered by someone's caller ID?