Feature: 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: Converter Material: Aluminum Alloy Colour: Black Size: Approx. 78 x 55 x 21mm/3.1 x 2.2 x 0.8in Interface: 5 x 3.5mm Headphone Jack Frequency Range: 20Hz-20KHz Parameters: 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 Output One Key Mute, Convenient and Fast, Very Practical in Special Occasions Plug and Play; No External Power Supply Required; No Impact on Sound Quality at All Compatible with Various Earphones and Speakers, etc. Package List: 1 x Converter 1 x Cable 1 x Manual Note: Please allow 0.1‑0.2cm/0.04‑0.08in error for manual measurement How To Use Method 1: Connect 4 to (input output) A B C D, use the 4 channel switch knob to get the output Method 2: Connect to input output, select (input output)output between A B C D (output can be switched between speakers and headphones) The 4 channel switch knob completely isolates the independent circuit, ensuring that each signal is not affected by the other three channels. All the items will be dispatched within one business day by Airmail after the payment is clear. Most times you will receive your order within 10-30 business days after we transfer your package to the delivery company. We cannot guarantee the delivery timeframe if the post office has any unexpected delays due to holiday,weather,customs, or other conditions. Some countries like Russia, Brazil, or some European countries may take up to 50 days or longer for delivery. We appreciate your patience if you haven't received items in 30 days(Russian customers may need more patience by reason of the local delivery system and/or customs). If you are concerned in any way, please feel free to contact us via ebay message instead of leaving negative/neutral feedback or opening a dispute. We will do our best to solve any problem(resend or refund any missingitem). Customs duty is obligation and liability of citizens in yourresponsible for any tax and custom duty incurred. Generally, thedelay or failure delivery is sometimes caused by the policy of different customs. Our listing price includes the value of goods,packaging cost,and export taxes,not including international duties. duties,taxes,and charges are not included in the item price or shipping fee. The duties are buyers' responsibility.Please check with your country's customs office determine what these additional costs will be prior to your purchase. All disputes arising from the duties will be submitted to ebay for solution. Any questions, pls. contact us via ebay message or email us. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. kindly leave us a positive feedback and give us the Detailed Seller Rating with all "5" in very area. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better.We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.