Usage Tips:[4 Port 3.5mm Audio Switch] 4(1)-IN-1(4)-OUT 3.5mm Audio selector Designed for Customers Having Several Audio Sources and Outputs. (Note: NOT a Splitter, Only One Input Can Be Played at a Time.) [Easy to Operate] 4 to 1: Connect 4 Audio Sources (like CD Player/ Computer/ Phone) to 1/4 Ports and 1 Audio Output (like Speakers) to IN/OUT Port. 1 to 4: Connect 1 Audio Source to IN/OUT Port and 4 Audio Outputs to 1/4 Port. [With Audio Selector] You Can Select Audio Input Sources and Audio Output Devices by Selector(A/B/C/D). Volume Control on the Switcher Easy to Use. [Long Distance mission] Use Standard Audio Cable, Input and Output mission Distance up to 8 Meters. Plug and Play, No Need Power Supply. [Wide Compatibility] Input Interface Is Compatible with PC, Phone, Laptop, Blue-ray Players and More. Output: Speaker, Headphones, Sound Bar and More Devices. (Only for Three-segment Headphones, NOT for Four-segment Headphones) input and output Analog signal: maximum support 2V p-p Input and output frequency range: 20Hz 〜20KHz Super small size; Compact and super mini size; Easy to place and suitable for your desktop and office. colour: black Material: ABS Size: 7.8x5.6x2.4cm Package Contents: 1 x Stereo 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.