Long Distance Wireless Karaoke Microphone: Wireless Distance Upgrade To 160 Feet (50m), Upgraded the microphone manufacturing process with 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.●We provide one year warranty..Plug And Play, Easy To Use: ●Can Only Plug In equipment with Mic input, Can't Plug In AUX input, Otherwise No Sound.(Not Compatible with Bluetooth Speakers and Laptop)●For With Mic input Speaker, Singing Machine, Audio Amplifier, Pa System, Mixer, Voice Amplifier And More Streaming Multimedia Equipment..●The Display Can Show The Battery Power And Signal Strength In Real Time, Don'T Worry About Suddenly Not Working..Microphone Battery Powered and Rechargeable Receiver: The Microphone Does Not Come With Any Batteries, We Recommend Using 2 AA Amazon Alkaline Batteries. ●Correctly install the battery + - direction.●the receiver should be charged for 5 hours before the first use●Long Press and hold the Mic and Receiver buttons to power on, The Chargeable Receiver Is Built-In 650 Mah Battery For 4 Hours work Time And Fully Charged In 3 Hours..Unidirectional Microphone: Built-In Professional Moving-Coil Unidirectional microphone core, when uses, the mouth should be close to the top of the microphone to loud voice for Conference, Speech, Outdoor, Church, Family Party, Open Ceremony, Dancing Instructor, Promotion, Etc.●If You Use Multiple Mic At The Same Time or Noise, Please Switch Channels(Open the mic battery cover, click the“HI LO”button), Make sure each mic channel number is different and the channel numbers are far apart..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 the 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.