Udigital 1080P 3RCA CVBS  L/R Audio or HDMI to HDMI Converter Box with Coaxial and 3.5mm Audio Output Upscaler 1 RCA or HDMI to HDMI converter and upscaler adopts new generation and low power consumption digital chip processing, 24/7 hours non-stop run, metal cases stable work. 2 Upscale the CVBS signals and the standard definition video format to high definition output; Downscale the high definition HDMI signal to RCA or standard definition output. 3 Inputs: HDMI or CVBS,5V power 4 Outputs: 1*HDMI, 2*Audio (Digital Coaxial Audio, and Analog Stereo Audio). 5 Warranty:1 year limited warranty by Udigital.*If there is no audio output,please contact with customer service,I will tell you how to set it.