Features 1.Special Design: 3.5mm selector specially designed for customers with multiple sources and outputs without power and drive easy to use. 2.1 Source: Choose 1 speaker or earphone (1 input source choose 1 output to earphone or speaker to avoid frequent replacement of earphone or speaker causing damage). 3.4 Sources: Choose 1 speaker or earphone (choose 1 out of 4 input sources to output to the speaker or earphone to avoid frequent replacement of sources). 4.Support 1 Output Input: The 3.5mm stereo switcher only supports 1 output input selection and cannot support 4 outputs inputs at the same time. 5.Compatibility: The 4 port 3.5mm stereo switcher is compatible with all devices with 3.5mm output ports such as mobile phones laptops computers MP3 MP4 headphones active speakers etc. Specification Item Type: ConverterMaterial: Aluminum AlloyColour: BlackSize: Approx. 78 x 55 x 21mm/3.1 x 2.2 x 0.8inInterface: 5 x 3.5mm Headphone JackFrequency Range: 20Hz-20KHzParameters: Two Way Switching Splitter Sharing Active Speakers and Headphones (Cannot Be Output at the Same Time) the Analog Signal Supports Up to 2V P P Input and OutputOne Key Mute Convenient and Fast Very Practical in Special OccasionsCompatible with Various Earphones and Speakers etc. Package List 1 x Converter1 xCable1 x Manual Note Please allow 0.1‑0.2cm/0.04‑0.08in error for manual measurement