In what countries can these modules be used?

Since the modules are based on a 2.4GHz frequency in the ISM (industrial, scientific ad medical) band then countries like Canada, USA, and Europe all have authority to use this band. Most countries have a number of license-free frequency bands. Products operating in these license-free bands do not require end users to obtain a license. However, such products must still conform to performance standards required by the country of operation, and it is the responsibility of the product manufacturer to ensure that such standards are met. Compliance is usually confirmed by testing in a government certified lab that provides a third party test report that governments then accept. Contact Us for more information.