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 level and volume adjustment control switch 3.5mm male input and XLR male output The product uses high-performance to noise Eliminates voltage loop and cuts line noise in a compact metal enclosure that's perfect for touring and bring great sound to countless gigs. Colour: Black Material: Metal Package Contents: 1 * Audio Noise isolator 1 * Storage bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.