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About product and suppliers:
            1,025 door open alarm products are offered for sale by suppliers on Alibaba.com, of which alarm accounts for 18%, lock cylinder accounts for 1%, and locks accounts for 1%. 

A wide variety of door open alarm options are available to you, 

There are 489 suppliers who sells door open alarm on Alibaba.com, mainly located in Asia. The top countries of suppliers are China, Hong Kong S.A.R., and Taiwan, China, from which the percentage of door open alarm supply is 94%, 5%, and 1% respectively.