Product demonstration (Note: OLED is not soldered to T-beam)
Features:
1. ESP 32 version: Rev1
2. WiFi
3. Bluetooth
4. 4MB pSRAM
5. 4MB flash memory
6. Three-dimensional antenna

product description:
1. Working voltage: 1.8~3.7V
2. Acceptable current: 10~14 mA
3. Transmitting current: 120 mA@+20 dBm
4. 90 mA@+17 dBm
5. 29 mA@+13 dBm
6. Working frequency: 433/470 MHz (433 HMz version) SX1278 /868m/915 m (868 MHz version) SX1276
7. Transmitting power: +20 dBm
8. Receiving sensitivity:
-139 dBm@Lora&62.5Khz&SF=12&146 bps
-136 dBm@Lora&125 Khz&SF=12&293 bps
-118 dBm@Lora&125 Khz&SF=6&9380 bps
-123 dBm@FSK&5 Khz&1.2Kbps
9. Frequency error: +/-15 kHz
10. FIFO space: 64 bytes
11. Data rate:
1.2k~300 Kbps@FSK
0.018K~37.5Kbps@Lora
12. Modulation method: FSK, GFSK, MSK, GMSK, Lora TM, OOK
13. Interface form: SPI
14. Sleep current: 0.2uA
15. 1.5uA@Idle
16. Working temperature: -40 degrees Celsius-+85 degrees Celsius
17. Digital RSSI function
18. Automatic frequency correction
19. Automatic gain control
20. Low pressure detection
21. Fast wake-up and frequency hopping
22. Highly configurable packet handler

Global Positioning System:
1. GPS module neo-6m, 3V-5V power supply universal
2. The predetermined module with ceramic antenna, super signal
3. Save configuration parameter data EEPROM
4. With data backup battery
5. With LED signal indicator
6. The default baud rate: 9600

power:
1. TP 5400
2. 1A battery management
3. LED indicator: there are 4 LEDs to display the battery status in real time
4. USB
5. CP 2104-GMR
6. Pre-Flash firmware

OLED description:
1. Size: 0.96 inches
2. High resolution: 128x64
3. Color: white
4. Viewing angle: >160 degrees
5.Driver IC: SSD 1306
6. Working temperature: -30~80 degrees Celsius
7. Module size (generous): 27.0mm x 27.0mm x 4.1mm
8. Support a variety of control chips: fully compatible with Arduino, 51 series, MSP 430 series, STM 32/2, CSR chips, etc. (a lot of examples are available for reference)
9. Wide voltage support: directly support 3.3V~5V DC power supply without any modification
10. Ultra-low power consumption: 0.04W in normal operation
11. IO port occupies the smallest display: IIC communication, as long as two IO ports