Quick Troubleshooting: ?1.Make sure you have enough power for the mic and receiver. ?2.Connecting equipment with MIC input, not other interfaces. ?3.If you find no sound from one or both mic, you need to re-pair.1.Turn off the receiver and mic.2. Open the mic battery cap.3. Press and hold the mic(HI LO)button for 10s+ until the display channel flashes.4. Quick turn on receiver, wait for the mic channel display to stop flashing, and the blue light of the receiver is always on, ready to use. Professional dual channel dynamic microphone: Built-In Moving-Coil Microphone,Widely Applied To Conference,Speech, Web Podcast,Youtube Recording, Outdoor Recording, Yoga Instructor, Church, Get Together, Family Party, Opening Ceremony, Dancing Instructor, Promotion, Game Etc ?If You Use Multiple Microphones At The Same Time, Please Switch Channels(?Part 4 Advanced Operations To 2 Note B,Page 8) Otherwise There Maybe Noise Or No Sound. Power and display: The Microphone Does Not Come With Any Batteries, We Recommend Using 2 Aa Alkaline Batteries. The Chargeable Receiver Is Built-In 650 Mah Battery For 4 Hours Use Time And Fully Charged In 3 Hours.?The Display Can Show The Battery Power And Signal Strength In Real Time, Don'T Worry About Suddenly Not Working. Wireless karaoke microphone system: Built-In High Sensitivity Professional Dynamic Microphone, Transmission Distance Upgrade To 160 Feet (50m) ?Signal Stability?No Delay?No Radiation ?Anti-Howling ?Anti-Jamming ?Constant Frequency?Distortion <0.2%?15 Uhf Adjustable Channels. The Mic Outer Case Is Alloy Material Which Is Harder, Lighter And More Wear-Resistant. ?Can Only Plug In Mic Jack, No Plug In Aux Jack, Otherwise No Sound Can Be Heard.(Not Compatible Bluetooth Speakers). Plug And Play, No Need Pair: Only Plug In Mic Jack. For With Mic Jack Speaker, Singing Machine, Audio Amplifier, Pa System, Voice Amplifier And More Streaming Multimedia Equipment. Use Trrs Cable To Connect Pc/Apple Iphone/Android Phone Laptops Etc.?Please Use Genuine Conversion Cables: Usb-C To 3.5mm/Lightning To 3.5mm Cable (Not Included In The Package), Otherwise, No Sound.?[Not Compatible Bluetooth Speakers/Macbook].