Features: - Transmission frequency can be set from within the range of 88.0 ~ 108.0MHz - 5W / 15W high-low power adjustable, transmission distance of 3-4 km (1.9-2.5 mi) in the open air - Designed with advanced modulation system and built-in PLL frequency, audio pre-emphasis, limiter, and low-pass filter circuit. - Good heat dissipation: using high-quality dual ball bearing fan, reasonable heat dissipation channels, excellent thermal performance - PC control: connect your computer via micro USB interface, plus supporting intelligent broadcasting software, to achieve diversification unattended broadcast. (time switch, time to play the specified music, etc) - 1/4 wavelength of strong magnetic sucker antenna, can be tightly adsorbed on the car roof or any metal flat objects, easy to move the antenna to the outside, the roof, balcony or window, more effective transmission and reception of electromagnetic waves!