It's the ESP32 with a SX1276 LoRa radio on board, this is extremely good value for money considering you are getting WiFi, BLE and LoRa in very compact form factor.
Voltage: 3.3V to 7V
Temperature Range: -40 ° C to + 90 ° C
Data rate: 150 Mbps @ 11n HT40,72 Mbps @ 11n HT20,54 Mbps @ 11g, 11 Mbps @ 11b
Transmit power: 19.5 dBm @ 11b, 16.5 dBm @ 11g, 15.5 dBm @ 11n
Receiver sensitivity: up to - 98 dBm