RioRand 0.5W Long Range (10km) Dual Mode Stereo Broadcast FM Radio Transmitter Powered by RioRand Advanced Technology The machine adopts high-quality aluminum production, and post-amp tube 2SC2053 cater to the cooling plate, five blue backlit LCD display frequency Japan ROHM motherboard dedicated next-generation integrated digital PLL FM stereo radio transmitter chip BH1415F, built-in PLL frequency PLL, audio pre-emphasis, limiter and low pass filter circuit. Makes the sound more sweet. panel formed by the STC2052; later stage by two 2SC3355, 1pcs 2SC2053 amplified a total of three power output. additional microphone input and audio amplifier circuit, the input volume adjustable;whole shielding, compact construction, small size, elegant appearance.