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The Whole House FM Transmitter 3.0 broadcasts a static free signal 150 feet in any direction. Compatible with most audio sources like TVs, Home Stereo Systems, iPods, Smartphones, MP3 players and computers. You will love the ability to broadcast your favorite music and audio sources to any FM radio. Integrates seamlessly with home and car stereos.* Frequency Range: 88.0 ~ 108.0 in 0.1 MHz steps* Pre-emphasis: US and EU Pre-emphasis Options* Frequency Response: 20Hz ~ 15KHz* Signal to Noise Ratio: >65dB* Audio Performance: 0.2% distortion* Stereo Separation: 40dB* Large Screen Interface: 1.34″ x 1.10″* Tuning Design: Stable PLL TechnologyPer the instructions, the power supply is not standard even though it looks like the same one as my Droid smart phone. They warn you not to use this supply on other items or any other supply with the phone.To sound its best, this unit requires a signal processor between the source and the transmitter. Either there is no AGC circuit or it simply does not work well. A good AGC circuit would help address the common complaint of low audio volume or under deviation. You are going to have to turn your remote stereo up to double the usual volume level, because if you try to turn up the volume level on the source device or try to turn up the "line in" volume on the unit, you are going to have terrible distortion. To sound its best, this unit requires a signal processor between the source and the transmitter. Either there is no AGC (Automatic Gain Control) circuit or it simply does not work well. A good AGC circuit would help address the common complaint of low audio volume or under deviation. A functional AGC would help to avoid over-modulation which is audio distortion. Instead, you have to turn the audio way down to about half way, thus making the unit transmit with much lower volume than broadcast stations.==Pre-emphasis==The advertising claims =, "''US/EU Pre-emphasis matches the emphasis to the FM radios in your region and reduces noise at higher frequencies.''"