T-Echo Card Frequency:868MHz Both the CC1101 chip and

Both the CC1101 chip and the antenna are designed to operate at frequencies in the 300-348 MHz

1 X GPS Antenna

TTGO_TWatch_Library/tree/master/examples/BasicUnit/TwatcV3Special/Microphone

4GHz ISM band operation 1

SoftRF Ham Edition

T-Echo Card Frequency:868MHz Both the CC1101 chip andPlease note that the default firmware currently does not support NFC. Specifications MCU NRF52840 FLASH 1MB RAM 256kB Wireless Bluetooth 5, Thread, NFC, Bluetooth Mesh, ANT, 802. 15. 4, Zigbee LoRa SX1262, Long Range, Low Power Support Bands 400~520MHz, 830~945MHz Display 0. 42 inch OLED I2C, Resolution: 72 x 40, Driver: SSD1315 GNSS Module L76K, Support: GPS, GLONASS, BeiDou, QZSS, Multi system joint positioning + AGNSS Motion Sensor ICM20948 Low