4 port Audio Switcher: Features: High-quality rotary switch. Hot-swappable (no need to reboot the computer). Super mini size: easy to place and fit on your desk and desktop. Plug and play: no power supply and other software required; Will not affect sound quality. Analog signal supports maximum 2V p-p input and output. Input and output frequency range: 20Hz ~ 20KHz. Use standard audio cable, input transmission distance up to 8 meters, output transmission distance up to 8 meters. Instructions for use: Method 1: Connect 4 audios to (IN/OUT)A/B/C/D, and use the 4 channel switch knob to get an output; Method 2: Connect audio to IN/OUT, select an audio output between (IN/OUT)A/B/C/D; (The output can be switched between speakers and headphones) 4 channel switch knobs, fully isolated independent circuit, make sure that each signal is not affected by the other three channels. Plug and play; No External Power is Required; Won't affect the sound quality! Note: Does Not Support a Microphone. Note: Only three-segment headphones are supported (four-segment headphones are not supported) Only one input can be played at a time. Package includes: 1* 4 Port 3.5mm Audio Switch Switcher 1* 3.5mm Audio Cable 1* User manual 2 port Audio Switcher: 2(1)-in-1(2)-Out 3.5mm Stereo Audio Switch Audio Switcher, 3.5mm Stereo Audio Switch Audio Switcher AB Switcher3.5mm Stereo Audio Switch Splitter 2 x 1/1 x 2, with Mute Button and No External Power Required 3.5mm Audio selector This is a bidirectional switcher for 3.5mm audio ports. 3.5mm audio selector designed for customers having several audio sources and outputs. Main functions: Select audio input between 1 and 2 with 1/2 switcher and get one output; Select audio output between 1 and 2 to receive one input; How to use: connect two audio sources (like a CD player/computer) to 1/2 ports and one audio output (like speakers) to an IN/OUT port; connect one audio source to the IN/OUT port and two audio outputs to the 1/2 port. Features: Easy installation and simple operation. Only need to lightly press to mute the device; very useful under special conditions. Plug and play; No power supply and other software required; Won't affect sound quality. Analog signal maximum support 2V p-p input and output. Input and output frequency range: 20Hz ~ 20KHz. Use standard audio cable, input transmission distance up to 8 meters, output transmission distance up to 8 meters. Super small size; Compact and super mini size; Easy to place and suitable for your desktop and office. Note: Only three-segment headphones are supported (four-segment headphones are not supported) Only one input can be played at a time. Package includes: 1* 2 Port 3.5mm Audio Switch Switcher 1* 3.5mm Audio cable 1* User manual