T-Echo Meshtastic Frequency:433MHz BME280 you need to purchase the

you need to purchase the main control module separately and then use it together

Integrated ESP32 with WIFI/Bluetooth

Micropython Flash 16MB PSRAM 8MB Antenna Ceramic (Default) Onboard functions Boot + Reset + Power Button FPGA Chip GW1NSR-LV4CQN48PC6/15 Device GW1NSR-4C Package QFN48P Speed C6/15 LUT4 4608 Flash 256K HyperRAM 64Mb Hardcore processor Cortex-M3 Development Development Designer Debug port JTAG

MCU ESP32-P4 Flash 16MB PSRAM 8MB Chip Features MIPI-CSI/ DSl

while the PCM5102 version can be driven directly through the ESP32-S3

T-Echo Meshtastic Frequency:433MHz BME280 you need to purchase theFCC, CE, MIC certificates for T Echo Specification MCU NRF52840 FLASH 2MB RAM 2MB Bus Interfaces UART, SPI, TWI, PDM, 12S, QSPI Wireless Connectivity Bluetooth 5, Thread, Bluetooth Mesh, ANT, 802. 15. 4, Zigbee With Without BME280 temperature pressure sensor SX1262 LoRa Transceiver Long Range, Low Power Global frequency coverage 433, 868, 915Mhz Enclosure material ABS Version Normal version BME280 version Battry Capacity 850mAh 1. 54 inch SPI E Paper