This item has 4 digital audio fiber input ports and 4 digital audio fiber output ports,4 digital audio fiber output ports can be switched to any of the 4 input ports, lossless audio digital audio transmission. It can be used in scenario that require digital audio fiber signal switching, such as venues and conference rooms. Support 4 digital audio fiber inputs; Support 4 digital audio fiber output; Support 5.1 channel/DTS/-AC3/LPCM audio format; Support button and remote control to switch. High-concerned chemical: None Plug Type: EU Plug Amplifier: No Type: Audio Matrix Model Number: Audio Matrix External Power Source: Yes Gender: Male Connector A: Optical Interface Connector B: Optical Interface,AUX Battery: No Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC220V Color: As Shown Material: Plastic+Metal Package Contents: 1 * Audio Matrix Switch Switcher Splitter 1 * Remote Control(Without 2 * 5V batteries) 1 * Power Adapter 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.