2PCS DC 3V-5V FM Transmitter Module DSP PLL 87-108MHz Stereo Digital Wireless Microphone Board Multi-Function Frequency Modulation with LCD Display Line/USB/Mic Input

These stupid little things are absolutely awesome. Are they the strongest transmitters? Absolutely not. Do they have the best sound quality in the world? Nope. But what these are, are FCC compliant and perfectly acceptable for broadcasting music for a Christmas Light Show. I bought the 2 pack because I assumed one would last a day. But 1 has lasted me 2 years outside running with no issues. I’m told that using the audio jack will result in better audio quality, but I find it really doesn’t make a noticeable difference when you’re actually listening to it in the car.