This is a 3-way passive stereo audio switcher. It supports 3 stereo XLR inputs and 1 output (or 1 input and 3-cut-one output). You can choose freely according to your audio equipment, and no power supply is required. Designed for customers with music equipment with multiple XLR balanced outputs. You can easily switch between different audio sources and compare their sound performance (-OUT version), and use 1 audio source and 3 amplifiers to compare the performance of your amplifier (1-IN-3-OUT version). The all-aluminum shell effectively avoids external noise and ensures high-quality signal transmission; the gold-plated XLR port ensures high-reliability electrical connection and minimizes signal attenuation during transmission. Each channel is connected with shielded wires to avoid external interference and lossless signal transmission. Exquisite appearance and compact size; it can be easily placed and carried, and you can enjoy the charm of music anytime, anywhere. Passive audio switcher, does not affect the sound quality; with silver-plated contacts to its smoothness; 4 wires switch mode and GND common end at the same time. Scope of application: 1. Switching between signal sources and amplifiers (or active speakers) such as CD players, digital players, set-top boxes, radio stations, decoders, etc.; 2. Switching between the front and rear of the amplifier. Note: A switcher, as the name implies, is a switcher. It cannot mix multiple input signals, nor can it output multiple signals at the same time; the signals can only be rotated in and out. Color: Black Material: Aluminum Alloy Package Contents: 1 x Audio Switcher 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.