Signstek 0.5 W 05B Dual Mode Long Range Stereo Broadcast Home FM Transmitter with Antenna and Free Audio Cable Fashion Black Equipment using advanced modulation system and built-in PLL frequency, audio pre-emphasis, limiter, and low-pass filter circuit. The FM Transmitter uses the control panel buttons to control the frequency to avoid any needs to reset the FM Transmitter Well-shielded, compact structure, small size, generous appearance, plug and play, very easy to use Control circuit board design and amplifier design to reduce noise, so sound quality is even better Transmission distance more than 300 meters (In the line of sight, field, open land)