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Is there a warranty for EZVIZ product?

Yes. Your EZVIZ product is warranted for a period of one (1) year [two (2) years for EU regions] from the date of purchase. 

Click here for more information on EZVIZ's limited warranty. 

How many sensors can one A1 hub connect?

One A1 can add 32 sensors, all kinds of sensors, totally 32.