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About product and suppliers:
        Alibaba.com offers 104 proximity warning system products. About 69% of these are alarm, 2% are locks, and 1% are other security & protection products. 

A wide variety of proximity warning system options are available to you, 

There are 104 proximity warning system suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Australia, which supply 93%, 2%, and 1% of proximity warning system respectively. 

Proximity warning system products are most popular in North America, South America, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 19 with ISO9001, 2 with Other certification.