4-Channel Professional UHF Wireless Microphone System: ●Bietrun 4 mics system Receiver and microphone connection distance is about 165 feet(50 meters). ●without dropouts, hiss, feedback, Clear Voice, Stable signal, high-quality sound. .●The microphone will automatically connect to the receiver. Microphones With Echo/Trebble/Bass: ●The wireless Four Handheld karaoke microphone set has echo, treble, and bass control buttons, you can use different sound effects according to different songs. Individual Frequency: ●Bietrun 4 channel wireless microphone system (WXM26A) frequency points are A-552.5/6/7/8/9 MHz, B-561.5/6/7/8/9 MHz, C-574.5/6/7/8/9 MHz, D-581.5/6/7/8/9 MHz. Each microphone has its own frequency, no bothering.(Use lawful signal bands(500 - 599Mhz) with US FCC ID). Microphone Battery Powered: ●The Microphone Does Not Come With Any Batteries, We Recommend Using 2 AA Amazon Alkaline Batteries. ●Correctly install the battery + - direction. Pro-Clear Vocals Dynamic Mics: Built-in dynamic unidirectional microphone core (95dB±2dB), Crisp, clear sound.without dropouts, hiss, or feedback. ●ideal for church, conference, speech, web podcast, Yoga instructor, family party, opening ceremony, dancing instructor, promotion etc. Plug and Play, easy to setup: ●The receiver has 6.35mm Mic and XLR A/B/C/D 4 channels output. ●You can choose 6.35mm cable(included) or XLR cable(Not included) you need to connect the other side to JBL Partybox, Sony SRS-XP series, ION Speaker, Amplifiers, DJ, Audio Mixers, PA system, Karaoke Machine, Multi-Media Equipment, Etc. Package Content: ●The package includes 1 receiver, 4 microphones, 2 antennas, 1 6.35mm TS cable, 4 mic foam covers, 1 power charger, and 1 user manual. Two-Year Warranty: ●Bietrun provides every customer with TWO-Year-Warranty! If you are not satisfied with this karaoke system or have any other questions, please feel free to contact us before returning.