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A communications device is provided, including an electronic part and a magnesium alloy housing. Constituents in a magnesium alloy material used in the magnesium alloy housing are configured according to the following mass percentages : aluminum : less than 10%; rare-earth element : 1% to 10%; manganese : less than 1%; zinc : less than 1%; zirconium : less than 1%; and calcium : less than 3%; and the rest is magnesium and an unavoidable impurity.