【Perfect Match Transmitters and Receivers】Step 1: Turn on the Four Transmitters, you'll notice that the indicator lights on the four transmitters will begin to blink, indicating they are ready to pair with the receivers.Step 2: Turn on the Receiver, You will see that as soon as the receiver is activated, it will automatically seek and connect to the four transmitters.Step 3: Successful PairingOnce you've completed the above steps, you'll notice that the indicator lights will remain steadily lit | 【4 Transmitters Wireless System, Remarkably Easy-to-Use】The BY-W4 features a wireless system that allows for up to four microphones to be used simultaneously, making it perfect for group presentations, conferences, or interviews. | 【Real-time Audio Monitoring】With a 3.5mm TRRS male to dual TRRS female cable, it allows users to fully monitor sound during the recording process at any time. | 【Compact & Lightweight】With a weight of fewer than 0.4oz, the BY-W4 is portable & convenient to carry around. Whether you're a musician, presenter, or event organizer, it is an excellent choice for capturing also amplifying clear also dynamic audio. | 【Two 3.5mm Output Cables to Maximize Compatibility】The BY-W4 receiver features two 3.5mm TRRS output cables that work seamlessly with either cameras, smartphones, computers, etc. | 【Incredible Broadcast-Quality Audio】With a high-quality built-in omnidirectional microphone also an impressive sensitivity of -42dB, the BY-W4 delivers much more clear & detailed audio, ensuring that your voice is heard loud & clear.