Fangrui Product Details Optical 3x1 Audio Switch: With These Digital Optical Spdif / Toslink Audio Switches, 3 Optical Toslink Sources Can Be Easily Connected To A Spdif / Toslink Signal Receivers (home Theater, Speaker, Amplifier, Soundbar, Av Receiver, Etc.). Support Last Working Status Memory When Power Off. Supports 3 Audio Formats: This Spdif Toslink Switch Supports Uncompressed Audio: Lpcm 2.0, Compressed Audio: Dts, Dolby-ac3, No Distortion Of Audio And Video, No Delay In Signal Mission, Enjoy Various High Quality Audio Quality And Provide An Excellent Listening Experience. Does Not Support 7.1ch Dolby Digital Plus / Dolby True Hd. Long Distance Lossless Signal Mission: Built-in Automatic Balancing System Ensures Smooth And Stable Signal Mission. Mission Distance Up To 40 M Via Fibre Optic Cable With Losses Of Less Than 0.2 Db/m, Sampling Frequency Up To 96 Khz. Surge Protection Can Prevent Damage Caused By Connecting An Unsuitable Power Supply To The Machine. Plug And Play: Easy To Use, Power This Audio Switch With