Feature: 1. 4 In 2 Out: The sound switcher allows you to input up to 4 different sound signals and automatically detects the source to output 2 signals, making it easy to share multiple devices. 2. Wide Applications: The sound switcher is perfect for various audiovisual systems, including public video systems, TV teaching systems, multimedia presentations, video conferences, computers, LCD HD display venues. 3. Strong Compatibility: The sound switcher is universally compatible with all devices that have RCA ports. It provides a seamless connection and integration with your existing sound equipment. 4. Stable and Reliable: With a high degree of isolation and strong resistance to interference, the sound switcher ensures stable signal transmission, providing reliable performance. 5. Plug and Play: Switching between devices is effortless with the sound switcher. Simply press a button to switch from one device to another, eliminating the need to unplug and reconnect cables. Specification: Item Type: Sound Switcher Material: Aluminum Alloy Input Ports: 4 Ports Output Ports: 2 Ports Video Input: 1Vp-p/75Ω Video Gain: 0dB≤dg≤1dB Sound Input: 2.2Vp-p/20KΩ Sound Gain: -3dB≤dg≤0dB Remote Control Battery Specifications: 1 x CR2025 (not included) Voltage: 100-240V. Package List: 1 x Sound Switcher1 x Power Cord1 x Remote Control