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From the development trend of audio products, the wire is an extremely important aspect sure to enjoy freedom of music. "Get gone the shackles of cable, using wireless method to enjoy music" could be the development direction of public expectations. In the current selection of wireless transmission protocol, 2.4G holdings are still high. The name Opal comes from three sources. One is the Latin word "Opalus". The second one is from your Greek word "Opalliois" meaning a difference of colour lastly from your ancient Sanskrit word "Upala" meaning precious stone. If one speaks of gemstone over these tongues the saying Opal would be Opallious upala, which suggests precious stone.Which shows of assorted colours when shifted against light.