AudiaX DGT-201 is one amazing device that lets you transmit the output from your iriver player or any portable audio devices on any standard FM frequency redirecting the audio signal to any FM receiver system within 10 metres be it your car's audio system or a boom box. Also you will be able to transmit in a frequency without interference for the clearest possible transmission. - 199 Channel Digital Tuning (88.1~107.9 MHz) - 1 MHz / 0.1 MHz control - Frequency control precisely - Powerful stereo separation - LCD display with backlight (Frequency Low power indicator) - Dual power usage of battery and car power cable (18 Hours usage of AAA Battery)