Wireless microphone headset system: Only for Mic Jack, not Aux Jack, otherwise no sound ●Built-in high sensitivity condenser microphone, transmission distance upgrade to 160 Feet (50m) ●Signal Stability●No Delay●No Radiation ●Anti-Howling ●Anti-Jamming ●Constant Frequency ●Clearer Sound Quality. Compatible voice amplifiers, multimedia. It is a portable Karaoke equipment.(Excludes Amp＆Not supported Iphone, bluetooth speaker, PC and Laptop) ●Obtained by FCC test. | Easy to use: Please turn on the transmitter and receiver power switches, the blue light will flash for approximately 2s. Indicator light stops flashing after a successful match, then you can use it. No further operation. ●Headset and handheld is 2 in 1 design, easily change the handheld mode to headset mode to meet your needs. Not supported Android Phones, Iphones, Macbooks, Laptop, Bluetooth Speaker. | Charge and work of wireless microphones: The transmitter and receiver are built-in 400 mah rechargeable lithium-ion batteries that can offer about 6 hours working time. ●Usb cable has two micro USB V2.0 to charge for the transmitter and receiver simultaneously. Fully charge is only 2.5 hours. ●Perfect Application: The plug on the receiver is 3.5mm. For 6.35mm amplifiers, please use the additional 6.35mm adapter（included）to connect more equipments. | Using multiple wireless microphone simultaneously: Please refer to the user manual to channel switching( Max 15 Channel ) in (●Part 4 Advanced Operations To 4.2 Note B, Page 8) Otherwise there maybe noise or no sound. Use up to 15 microphone headset at the same time. Built-in cardioid polar pattern condenser microphone, widely applied to conference, speech, Web podcast, outdoor Live, Yoga instructor, voice amplifier, dancing instructor, promotion, game etc. | What if can't pair or no sound: ●1, Turn off the receiver and transmitter ● 2, Turn on the transmitter（Handheld Microphone), blue light is on, long press “+ ” to flash the blue light ●3, Turn on the receiver and wait for connection ●4, The blue lights of the transmitter and receiver stop flashing, the connection is successful.