Other than standard RF solution available that requires compliance, product can
select to use Proprietary RF as the communication protocol. The operation frequencies
can be in range of 4XX MHz, 8XX MHz, and 2.4 GHz depend on different
countries unlicensed RF band that can be used. The product then requires to
get the approval from an authorized laboratory based on different countries
requirement, such as FCC for US, IC for Canada, RED and CE for EU countries.