Features : * Phase Lock Loop (PLL) System * Easily choose your frequency LCD and buttons * Freq range :88MHz 108MHz * Power :15w * Ripple or harmonic waves: <= -60dB * Tuning Step : 100khz * Stability of Frequency: ±5ppm Less than 10ppm ( better system) * Freq. Response: -55dB(100 5000Hz); -45dB(5000 15000Hz ) * Audio Input Connector: 3.5mm headphone connector * Microphone jack;it can be connected wih the microphone * BNC Type antenna output * Reduced harmonic ( clean signal ) Do you wanna a stereo FM transmitter in a professional quality? I know u can do that. This FM stereo transmitter, using advance modulation system and Phase Lock Loop to control a steady frequency when transmitting. New invented low noise system is used to reduce the noise level during broadcasting time. A digital stereo system is used and control the stereo separation at great condition.with a high gain antenna ,it can easy broadcast anywhere you want, home , apartment ,church ,school , club, camping , backyard , resident village.This Broadcast Package is plug and Play design, very easy to use , as you could see you could use it at instant.so you really could enjoy the stereo transmitter! Note: * Connect antenna first before connecting transmitter to DC supply, otherwise, transmitter will be burned out.