Battery Size Reference

 Specifications

MCU	ESP32
Flash	4MB
PSRAM	8MB
Driver	CH9102
Wireless protocol	Wi-Fi + Bluetooth 4.2
PMU	AXP2101
Onboard functions	3 Buttons (Power+IO38+Reset)
Power Supply Mode	Support USB / 18650 battery
NEO-6M GPS Modules	Support GPS protocol Onboard RTC crystal, Support interrupt/wakeup

Long Range Low Power LoRa Transceiver:

High sensitivity	-148 dBm
Transceive rate	300 kbps
LoRa Chip Name	SX1276

Sample Code For Reference [Github]

If you need technical support please check below link to find more details.

T-Beam Helium

Pin Diagram

 More Details

 

915MHz

868MHz