The 21.38" version of Audio-Technica U857RU, the U857RLU UniLine condenser adapter-mount gooseneck microphone features Audio-Technica's UniLine line-cardioid element. The microphone's ultra-flexible, robust, small-diameter gooseneck permits easy adjustment into desired shape while resisting inadvertent repositioning. The microphone direct mounts to any 5/8"-27 stand. Equipped with UniGuard innovations that offer unsurpassed immunity from radio frequency interference. The phantom-powered Audio-Technica microphone also offers an 80 Hz low-cut UniSteep filter that reduces pickup of low-frequency ambient noise.