J-Tech Digital SPDIF / TOSLINK Optical Digital Audio 4x4 True Matrix with Remote Control Professional Enterprise Grade Product; Full Metal Jacket Construction Active IC Circuit (not a mechanical switch) for Optimum and Lossless Signal Transfer; Reliable & Flawless Switching 4 Inputs & 4 Outputs for Optical / SPDIF / TOSLink Audio Management; A True Matrix for Any Input to Any Output Support Data Rate Up To 16Mbps; Support Output Distance Up To 30M Free lifetime technical support from the manufacture and free 1 Year Manufacturer Warranty from J-Tech Digital.