The RAK2013 is a Raspberry Pi cellular communications module that supports 3 cellular standards: 2G/EGPRS, 4G CAT4 / LTE Cat-M1(eMTC), Cat-NB1(NB-IoT).
The RAK2013 integrates audio codec and audio amplifier on it, with carrier operator’s network, it also supports Voice-over-LTE (VoLTE) for high definition (HD) and uninterrupted voice calls. For easy use, there are earphone connector, MIC connector and speaker connector with audio amplifier.