100 Selectable frequencies on each channel, up to 20 sets can be used at the same time | Automatic frequency scanning to find and set the most interference-free channel in the area | Automatic transmitter setup, the channel of the transmitter and receiver can easily synchronize | Backlit LCD display showing RF level, AF level, Channel Frequency and mute status | Range: Up to 400 feet ( 150 meters ). Frequency: 530Mhz - 580Mhz ( Adjustable )