The system features a 4-channel receiver unit and 4 handheld microphone transmitters, The front panel features color-coded level controls and the transmitters are also color coded to easily distinguish their appropriate channels, The rear panel features both balanced and unbalanced outputs for connecting to professional and consumer audio gear, Operation Range up to 250", Selected VHF frequency to avoid interference, Feedback rejection function effectively reduce howling, Optional mixed or individual output to connect with any mixer / amplifier, Squelch Control: Noise-lock, Frequency Deviation: +/- 18kHz, Frequency Response: 80Hz-15kHz, Frequency Stability: +/- 0, 005%, S/N Ratio:>70dB, Total Harmonic Distortion: <0, 5 % (at 1kHz), Number of Channels: 4 Channels, Receiving Sensitivity: -80dBm, False Image Interference Rate: =80dB, Harmonic Interference Rate: =50dB, Transmit Power: <10mw, Receiver Power Supply: DC 12V/500mA, Transmitter Power Supply: 9V battery, Color for Frequencies: Orange: 188, 6MHz, Violet: 204, 8MHz, Red: 181, 25MHz, Green: 209, 5MHz,, Accessories: AC Adaptor, 9V Batteries, User Manual, SKU: TBALL9981