DUAL-CHANNEL WIRELESS MICROPHONE SYSTEM The latest lapel microphone with 2 transmitters(microphones) supports two guys recording videography without wire. 2.4GHz DIGITAL TRANSMISSION Based on 2.4GHz and improved Syncoder tech delivers more stable and clearer audio for your DSLR, camcorder, smartphone, or tablet. PLUG AND PALY It will auto-pairing after power on. ( Long pre the Receiver and Transmitter power button for turn on, and thenr indicator green light is always on. ) No Bluetooth required. No need to download an App. NOISE CANCELLATIONWirele microphone power-on default noise cancellation, output clear, crystal, natural audio without floor noise. LONG WORKING TIME The wirele microphone for the iPhone built-in a 400mah battery, charges for 2.5 hours, and last 8-10 hours, good for outdoor short films and podcasts. REAL-TIME MONITORING The receiver has a 3.5mm TRS headphone jack for for ensuring you track the sound effect during a shooting in real-time. Extra Compact, Perfect for Outdoor Recording Only weighing 25g each with pocket-size dimensions of 48.5x32x14mm, it comes with a carrying bag and is easy to carry around for outdoor recording especially vlogging, video shooting, and interviews.