Connects 3 Digital Audio Sources To a Single Digital Audio Output, OR A Signal input to 3 output. 3 Input Fiber Optic Toslink Digital Audio Switching. Output Connects Directly Into TV Of Home Theater Receiver. PCM, Digital & DTS Signals Can Pass Through This Unit Expands The Capacity Of A Home Theater's A/V Inputs. 3x1 3 way optical audio toslink bi directional manual switch. There are four optical digital jacks. The output jack connects to the main unit to which you would like to expand the number of optical jack (normally a digital audio/video receiver/amplifier). The three input jacks connect to devices and allow you to output digital audio to your main unit. Switch easily between sources instead of disconnecting and reconnecting cables when needing to change inputs. The compact design fit in tight areas between components. Works with the Following Digital Audio Components Home/portable digital audio components with optical connection. MP3/CD/DVD player including Blu-ray/HD DVD. Video game consoles (/XBOX360). Computer sound card, cable/satellite receiver to your home theater system with a digital optical input. Operation To hear your connected sources through your home theater system, 1. Turn on your home theater system and the audio source you want to hear. 2. Then in the lock release button on the selector's dial and rotate the dial to the indicator corresponding with you want (1,2, or 3). 3. A green indicator shows which of the three units is (only one can be at a time). 4. Release the button to lock the selector in place. 5. The sound from the source comes through your home entertainment system's speakers. Color: Black Material: ABS Package Contents: 1 set * fiber optic audio switchers 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.