Features:

Now you can use your MP3 to listen to your favorite tunes through any
FM stereo receiver. LK-128BFM Transmitter wirelessly connects portable
Music players to your car or home stereo quickly and easily.
Just plug the FM Transmitter into the headphone jack of your MP3 or any
Audio source including your PDA, CD, or cassette player; or connect it to your PC or laptop computer. Tune your car stereo or receiver to the clearest FM frequency, and enjoy your digital music with full sound and convenience.

Advantages:
1) Frequency:87.7-107.9
2) Audio Frequency Range:50Hz to 15Khz
3) Operating Range: Over 30 feet
4) Channel select: Preset 4 channels, the max channel are 14, you can adjust the switch beside the unit to set your favourite channel freely.
5) Four red LED blink at about 2Hz that indicate the current channel you set, also it make the unit more beautiful.
6) Dual power supply model:(2 AAA bat or external DC are available), rechargeable battery are recommended beacuse of the recharge circuits are built in, that can charge the battery in little current while plug the external DC.