J-Tech Digital Premium Quality RCA L/R Analog Audio to Optical SPDIF/Coaxial Digital Converter with 3.5mm Jack Support Headphone/Speaker Outputs (Analog to Digital) Converts analog L/R signals to TOSLink or Coaxial; TOSlink and Coax digital outputs may be used simultaneously. Supports 48 kHz output sampling frequency Coaxial and optical outputs; L/R RCA Stereo & 3.5mm inputs Free lifetime technical support from the manufacture and free 1 Year Manufacturer Warranty from J-Tech Digital.