ESP32 LoRa V4 Development Board +L76 GNSS Module +3000mAh Battery +Black Case, ESP32-S3 SX1262 LoRa WiFi Bluetooth 2MB PSRAM 16MB Flash 915MHz Antenna OLED Support GPS Solar for Meshtastic

the red device is just a standard Meshtastic node, there was nothing special about it other than it had an upgraded antenna on it. You can find that one and various others all over amazon. https://www.amazon.com/Meshnology-Development-ESP32-S3-Bluetooth-Meshtastic/dp/B0GQ327CLG You can also read up on the basics here: https://meshtastic.org/docs/getting-started/