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 StabilityNo DelayNo Radiation Anti-Howling Anti-Jamming Constant Frequency Clearer Sound Quality. Compatible voice amplifiers, multimedia. It is a portable Karaoke equipment.(Excludes AmpNot 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 batteri