The NIORFNIO 15W FM Transmitter ensures a crisp and clear audio broadcasting experience, offering adjustable frequencies between 87 - 108MHz and a high-low power range, capable of transmitting up to 3-4 km (1.9-2.5 mi) in open areas. Boasting FCC certification, this device provides stereo and mono channel switching, and high-fidelity Bluetooth connectivity to various devices. With its advanced modulation system, built-in PLL frequency, and audio pre-emphasis, enjoy stable, quality transmissions. Efficient heat dissipation is achieved through a high-quality dual ball bearing fan and astute heat dissipation channels, ensuring durability and consistent performance. Experience convenient PC control with intelligent broadcasting software for diversified, unattended broadcasting options and utilize the 1/4 wavelength strong magnetic sucker antenna for effective transmission and reception.