LDream Mini FM Transmitter 3.5mm Input for All Smartphones and Players Wireless audio streaming: Streaming music from any music player with 3.5mm headphone jack over your car stereo system to let you enjoy high quality audio experience. Better performance: Anti-static interference hands-free talking during driving, clear and convenient to adjust the tuning frequency Stable design: Adopt SMD crystal material, longer life span and optimized stability than other similar products Longer play time: Built-in lithium battery, can last 1.5h longer than previous version Special auto power-off: When no music input for one minute, it will shut down automatically for the energy saving purpose