LILYGO T-Echo Card is a thin development kit based on Nordic Semi nRF52840 wireless MCU and a Semtech SX1262 LoRa transceiver with a solar panel for charging an 800 mAh battery. It supports Bluetooth 5, NFC, Bluetooth Mesh, ANT, 802.15.4 (Zigbee/Thread), LoRaWAN, and GNSS (L76K module) connectivity. The board also features a 0.42-inch OLED information display, a magnetic USB interface, a 9-axis motion sensor, a digital microphone, a speaker, and an RGB LED for status/notifications. Besides the default firmware, the T-Echo Card is supported by the popular Meshtastic and MeshCore off-grid communication firmware. You won’t find the T-Echo Card in the Meshtastic web flasher for now, but support was already merged last May, and you could build the firmware yourself.