Amazon.com.au:Customer reviews: Proster HDMI Audio Converter HDMI to HDMI + Optical SPDIF/ Toslink RCA L/R Audio Extractor-HD Digital to Analog Converter DAC HDMI Video Adapter up to 1080P for PS3 PS4 Blu-ray DVD Player Xbox One SKY HD Box
The User Manual reads: Power adapter format: (...) Output: DC5V/1A
The supplied power cord can be connected to a USB outlet but those chargers usually output 1.5 to 2.1 A. Also, an important information is missing from the unit / User manual: its polarity. Assumably though, the pin is the positive but if not, the first use can damage the unit. Any experience?
(I will update my rating after receiving relevant information from seller.)