NADY UHF-4 LAVALIER MIC SYS.OMNI-DIRECT LAVALIER M, DigiTRU Diversity for optimum range with freedom from dropouts , Utilizes the uncluttered UHF frequencies for Interference-free operation in any application or locale, Locking 3.5mm mini-jack provides secure connection for removable microphone or instrument cable, Both 1/4" unbalanced and XLR balanced outputs, Tone squelch for locking out potential interference, A/B diversity and 5-segment AF level LED displays, Volume and mute (squelch) adjust control, Special circuitry for noiseless transmitter on/off switching, Frequency response: 30Hz-18kHz, Half-rack receiver design with retractable front-panel dual antennas , Unique snap out panel locking tabs for single or dual receiver optional rack mounting, Transmitter operates using one 9V battery, Includes AC/DC adapter