SHIDU product has got lots of praise since it came to sell, it was rated as leading firm by educational circles in China, with the ability of two millions products per year Shidu is the largest manufacturer of voice amplifier in China, it has got numbers of technical patent, and promote many criterion of this industry. Shidu takes ‘Innovation changes future’ as a concept, takes ‘Quality, Value,Perfect,Dream’ as a core values to supply worthy products and services for the customers.

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