CZERF CZE-05B 0.5w 54~68mhz Long Range Dual Mode Stereo Broadcast Home Fm Transmitter with Antenna, Silver The product crust is made of high-quality aluminum, which also is the heating panel of power amplifier RD06HVF1, with blue backlight LCD to display five digits of frequency. The motherboard is applied with chip BH1415F, which is the new-generation integrated NC FM stereo radio chip by ROHM, built-in PLL frequency, audio pre-emphasis, limiter and low pass filter circuit. Make sound more sweet. The control board is designed with high performance MCU STC series,its performance is better than AT89C2051. With microphone and audio input of the amplifier, adjustable input level. Transmitting power can switch between 0.1W and 0.5W. (How to switch Press and hold the power switch button then plug in the power, when the LCD display L or H, then release the power button. By the buttons + and - to switch the transmitter power.) with a high gain antenna ,it can easy broadcast anywhere you want, home , apartment ,church ,school , club, camping , backyard , resident village.This Broadcast Package is plug and Play design, very easy to use , as you could see you could use it at instant. Good shielding, compact structure, small size, generous appearance.