1) Frequency:
A. 88.1 88.3 88.5 88.7 88.9MHz OR
B. 107.1 107.3 107.5 107.7 107.9MHz.
2) Preset 5 channels ;
3) Audio frequency range: 20Hz-20KHz;
4) Operating range: 10-30 feet
5) Power light and frequency LCD indicator;
6) Power source:2AAA batteries or the car's power source. 
7) Accessory:1 car charger.
8) Operation introduction:
a) Plug FM transmitter into your music player
b) Set FM transmitter and your radio to the same FM frequency
c) Turn on the FM transmitter and the music player
d) The music will be transmitted from the player to the FM radio wirelessly
e) Enjoy your music now
9) Note: For best results, select a frequency that has the weakest or no signal
from radio stations .
10)2 AAA batteries included .
11)Prodigy CO., 1-year warranty