The Grove - LoRa Radio 868MHz module has a RFM95 module, which is a transceiver featuring the LoRa long range modem that provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. The heart of the Grove - LoRa Radio 868MHz is an ATmega168, a widely used chip with very high-performance and low power consumption, especially suitable for this grove module.
A simple wire antenna is wired on-board to receive signal. If the signal is too weak to receive, don’t worry, the MHF (U.FL) connector next to the antenna is for adding a second antenna to gain more signal.
This is the 868MHz version, which can be used for 868MHz communication. We also have a 433MHz here.