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Richupon optical digital audio optical digital audio goes through several adjustments as Richupon Industrial (Shenzhen) Company Ltd., invests great efforts in technological innovation. These efforts include product innovation and process innovation. The product is further upgraded by a team of senior expert adopting pioneering technology. The manufacturing process is properly upgraded with new production facilities imported from leading suppliers. The product is bound to have a stable performance.usb to parallel adapter,usb to phone adapter,nvme usb adapter.