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 1W and 7W. (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.). Good shielding, compact structure, small size, generous appearance. Technical Specification: Power supply voltage: DC 12V Operating current: 2.5A Frequency range: 76 ~ 108Mhz Frequency step: 100kHz Frequency stabilization method: PLL Frequency stability: ± 10 ppm (-10°C to +60°C ) Frequency deviation: Less than ± 75kHz (100%) Working method: Continuous Clutter and Harmonic: Less than -60dB SNR: More than 60dB Stereo channels crosstalk: -50dB Audio frequency response: 20 to 15000Hz Audio distortion: Less than 2% Modulation: 15% Input level:-15dBV (adjustable) RF output impedance: 50 Ohm RF output power: 1W/7W (Power can be switched) Reference range: 3Km - 8Km (A barrier-free environment) Unit dimensions: 160mm(L) * 95mm(W) * 54mm(H) Package Content: - SainSonic AX-7C FM Transmitter *1. - Aluminum Professional Antenna *1. - Power Supply *1. - Power Cord *1. - Audio Cable *1.