AKG GN15 ESP 15cm Gooseneck Microphone with Programmable ButtonThe mode selection jumpers are hidden inside the housing so they cannot be realigned unintentionally. An LED ring provides a clearly visible MIC ON OFF indication. The bank of jumpers also allows the LED ring and the integrated bass rolloff filter to be enabled or disabled. In addition, the new electronic circuit design provides high immunity to radio frequency interference. Features Programmable mute switch High RFI (Radio Frequency Interference)