If you have a bike, the Vizalert Helmet radar/Laser Jammer Alert is essentially a head-up-display that attaches to your helmet, wirelessly receiving signals from a laser jammer and radar detector. Six small LEDs indicate different warnings, and motion detector turns the unit on when you pickup your helmet. Peripheral vision will take care of the rest, and this should save you enough to get your money back. Think of it as a long-term investment. $200.