Features 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. specificationItem Type: Sound Switcher Material: Aluminum Alloy Input Ports: 4 Ports Output Ports: 2 Ports Video Input: 1Vp-p/75 Video Gain: 0dBdg1dB Sound Input: 2.2Vp-p/20K Sound Gain: -3dBdg0dB Remote Control Battery s: 1 x CR2025 (not included) Voltage: 100-240V PackageList1 x SoundSwitcher 1 x Power Cord 1 x Remote Control