NKTECH CZE-15A Backlight LCD 3W/15W 87.5MHz~108MHz FM Stereo PLL Radio Broadcast Transmitter Silver Frequency range from 87.5MHz to 108MHz, Output Rower: 3W/15W. Do not touch the antenna when transmitter powered. Transmitting power can switch between 3W and 15W. Reference Range: 10Km-18Km (A Barrier-Free Environment). Blue backlight LCD to display five digits of frequency.