Fumbling with buttons on a two-party communication device can be a bother for motorists busy parking or navigating in tight situations. Eartec's hands-free TD 900 wireless radio is designed with them in mind. Using two frequencies, the radios send and receive signals simultaneously, so users can speak freely, as they would on a telephone. Each 10-ounce radio, from Eartec Co., is powered by a rechargeable battery, which should last for about four hours. The radios have a range of a quarter mile, so reception should be clear in or out of your vehicle. The price includes two radio units, two lightweight headsets, batteries, and battery charger.