What is the fine-grained topic of the following text: eRIC (easyRadio Integrated Controller) SMD modules are currently available in 3 variants: the eRIC4 RF module for European 433/4MHz licence-exempt ISM band; and the eRIC9 dual-band RF module for European 868MHz and USA 902-928MHz licence-exempt ISM bands and the eRIC-SIGFOX, Sigfox 868MHz RF module. Only return the topic.
eRIC SMD modules variants