Wireless Lavalier Microphone System Set This professional clip on lapel mic kit includes one receiver (RX), two transmitters (TX), and a charging case that recharges them twice (1.5 hours each time). At a full charge, RX lasts 9 hours, TX lasts 8 hours for extended video recording, stage, vlogging, interview, podcasting, and live streaming. RX features a 3.5mm audio jack for audio monitoring. NOTE: For optimal battery longevity, please fully charge the mic set before first use 4GB Storage Standalone Recording Each transmitter with 4GB storage doubles as a recording pen to save up to 9 hours of uncompressed 48KHz WAV audio files (up to 30min each) and supports decibel (dB) gain with a tap. Low frequency ensures accurate and warm voice recording. An LCD screen displays export modes, volume, battery levels, connection status, noise cancellation, and other info. 3 audio export modes available: Mono, Stereo, and Ms One Click Noise Canceling/Mute Transmitters offer one clic