Bumper stickers were all the rage in the 1980s, with signs like "Baby on Board" reminding drivers to avoid tailgating. The trend is back, in updated form, with Roadmaster USA's Scrolling Digital License Plate Frame, which displays scrolling messages on a car's license plate or back window.

Those signs can be an eyesore, but Tzero Technologies is making some relatively eye-pleasing activities possible: The company's chip set supports wireless transfers of high-definition images between devices. Also enhancing the entertainment world is Shure's new (albeit expensive) line of earphones, which promise improved sound and bass.

Roadmaster's Car Message

With the ability to display warnings such as "Your lights aren't working," Roadmaster's LED message bar may help drivers avoid police busts. The Scrolling Digital License Plate Frame is an LED bar that can display any of 99 preset messages that come with the product (e.g. "Help me," "Slow down," or "Baby on board") or any user-created message (such as a for-sale price for the vehicle) of not more than 120 characters and spaces.

Users can display a single message in nonscrolling mode, and can adjust the LED's speed and brightness via a wireless remote. The company recommends, however, that customers check state and local regulations before using the scrolling system while the car is in motion. A similar product is available for mounting on a car's rear dash. Both can be bought online at Roadmaster's Web site, at retailers, and at car dealerships.