It is widely used in laptops, MP3 players, CD players, mobile for phones, tablets) and other line level signals to convert the left channel and right channel summed microphone-level balanced signal output. The product provides level signal volume adjustment control, 1/8inch (3.5mm) TRS male input and 3-pin XLR male output. A separate unit converts an audio device level signal input to a microphone grade balanced signal XLR output. Output with independent level and volume adjustment control switch 3.5mm male input and XLR male output The product uses high-performance transformers to eliminate noise Eliminates voltage loop hum and cuts line noise in a compact metal enclosure that's perfect for touring and will bring great sound to countless gigs. Colour: Black Material: Metal Package Contents: 1 * Audio Noise isolator 1 * Storage bag