Each year car, more and more new cars include built-in connection options for iPods, iPhones, and Bluetooth devices. But if you're not yet in the market for a new car, you can still get such connectivity via an aftermarket upgrade. Sony's MEX-BT5700U, a member of the company's Xplod line of automobile head units-is a solid option that lets you connect both iPods and iPhones.
The MEX-BT5700U is designed to occupy one DIN-a standard unit of measurement for car stereos, about two inches tall by seven inches wide. The vast majority of cars on the road have either a one-DIN or a two-DIN opening in the dash for the audio system. My car, a 2004 Kia Sedona minivan, has a two-DIN spot, so the custom-stereo installer used a spacer pocket to fill and cover the extra space. The unit Sony supplied for this review fit well, with installation taking about an hour.















