1>It is able to change the audio signal into frequency modulation signal and transmit wirelessly to the speaker in the car or at home and player 2>Full frequencies ,every frequency between 88.0 and 108.00 MHZ can be chosen. 3>Blue backlight,LCD display.frequency can be adjusted freely and shoen on the lcd: 4>Power :2"AAA" battery ,work for over 12 hours: 5>Able to work with any audio playing device such as CD,VCD.DVD. 6>S/N :80db,radiation distance:within 30meters