Although more car stereos and audio devices today feature either a direct iPod dock or a 3.5 millimetre stereo "aux" jack to allow you to connect your personal media player, there are still a number of devices in use that lack these connections. Installing a Belkin TuneCast II FM transmitter will allow you to play portable media devices in your automobile.
Put two AAA batteries into your TuneCast II. Alternately, if you have the DC power cord, you can plug that cord's connector into the jack on the bottom of the TuneCast II and then plug its other end into the car's cigarette lighter.
Plug the TuneCast II's stereo mini-plug into your media player's headphone jack.
Turn your media player about halfway up and play some music or other signal. The TuneCast II should turn itself on.
Tune your radio to an empty FM frequency. If you cannot find an empty frequency, find one where the station that is being broadcast is as weak as possible.
Use the up and down buttons on the right side of the TuneCast's front face to tune it to the frequency that you have selected on your radio. You can hold either one down to tune quickly.
Store the selected frequency by holding the MEM button down for two seconds. When M1 starts to blink on the display, use the arrows to choose which of the four memory slots you want to use, and then press MEM to store the frequency. You can, in the future, use stored frequencies by tapping the MEM button to cycle between the four banks.
Adjust the volumes on both your media player and FM radio to your desired level. Remember that if you turn your MP3 player down too low, the TuneCast II will automatically turn off.