B877 3 Channel Personal Listener Headset Listening Mixer (Black) About The Product 1. LINEPAUDIO B877 personal listener. Designed for players who want to listen to their voices via headphones or earphones, such as their vocal and musical instruments, mainly for drummers, who need to mix click tracks with listener signals. Church choir singing and others needs to listen to the sound of their music. All 3 stereo channels personal monitor desk headphone mixer, 2. Three input channels are outputted by 14 and 18 (6.5 and 3.5 mm) of headphone holes through various level controllers, and the microphone channel and device output are connected to ground switches. Easy to eliminate the current ground buzzing noise. This product is an ideal choice for live band and church musicians as well as studio musicians and singers. It has the ability to customize the main music and the voice and instrument input of musicians. Make the product become an effective and multifunctional listening device. 3. Line input: 14 TRS stereo Jack for connecting line level signal sources, such as mixer listening auxiliary output, cassette player output, CD player output, and etc. 4. Ground connecting: Plug jumper to disconnect the chassis grounding input of microphone pin 1 and the microphone passes through. 5. The microphone: XLR Jack is in parallel with the microphone input Jack (hardwired) for delivery to the mixer or other microphone-level input device. 6. Microphone input: XLR balanced Jack for connecting capacitors or moving-coil microphones. 7. Device input: 14 TRS stereo Jack for connecting device or line level signals, such as guitar processors, keyboards, musical instruments, keyboards, or previous outputs of musical instruments. 8. Mono stereo jumper: Select whether the input Jack is mono or stereo. 9. Left right output: Transformer balanced XLR output from device input. 10. hGrounding route: A plug jumper used to disconnect the chassis from the output Jack of the 14 RS device. 11. Mono ste