1、The plug can be folded and can be used conveniently 2、Wireless transmitters and receivers can be used for electroacoustic instruments like guitar, bass, violin... 3、Uhf 730mhz original transmission, anti-interference, super short time delay 4、Support simultaneous use of 4 sets of devices, the maximum transmission range reach 50 meters 5、Built-in rechargeable lithium battery provide long hours of work, equipped with USB cable, easy to charge Features: The plug can be folded and can be used conveniently Wireless transmitters and receivers can be used for electroacoustic instruments like guitar, bass, violin... Uhf 730mhz original transmission, anti-interference, super short time delay Support simultaneous use of 4 sets of devices, the maximum transmission range reach 50 meters Built-in rechargeable lithium battery provide long hours of work, equipped with USB cable, easy to charge Easy to use, small size, light weight, and easy to carry Specification: Color: black Material: ABS, Metal Audio response range: 20Hz-20kHz Frequency: high frequency 806-809mhz Transmission range: max.50m (barrier-free); 30m (through the wall) Transmission delay: less than 4ms Charging time: 2 hours Continuous use time: 4 hours Charging port: micro USB Weight: Approx. 237g Package List:  1 x Transmitter 1 x Receiver 1 x USB Cable 1 x ManualNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.