Some types of car chargers have dual purposes. One popular type works as a battery charger as well as an FM transmitter, and is a popular choice for MP3 players or phones that can play music. The charger will charge the battery of the device while broadcasting the music over one of the FM channels on the radio in the car, as selected by the user.
Car chargers can be found in virtually any electronics store or cell phone retailer. They are typically fairly inexpensive, and are a good idea to keep in the car in case of an emergency. In addition to car chargers that plug into the cigarette lighter outlet, newer types of chargers are now being sold. These include solar chargers as well as manual chargers, which feature a hand crank that the user can turn to charge the cell phone's battery.
