Heltec LoRa Node Products Difference Table Heltec LoRa product family already included follow options LoRa spread spectrum communication node Battery powered Good RF circuit design and impedance matching ProductType①MCUFLASHBatteryBattery DetectVext③Low Power④DisplayWiFi LoRa 32Dev BoardESP324MBLithium②xxxOLED 128×64 WiFi LoRa 32 V2 Dev BoardESP328MBLithium②√√800uAOLED 128×64 This item Wireless StickDev BoardESP328MBLithium②√√800uAOLED 64×32 Wireless Stick LiteDev BoardESP32 PICO4MBLithium②√√35uAxWireless ShellModuleESP32 PICO4MB √x10uAxLoRa Kit 151Dev BoardSTM32L151CBU6128kBLithiumxx7uAxLoRa Node 151Dev BoardSTM32L151CCU6256kB1 2 AA Lithium chlorine sulfite battery√√1 8uAxTurtle BoardDev BoardSTM32L432KC256kBAAA x 2√√5uAx Notes ① Type Dev Board Can be used directly Module Only core function need to cooperate with external PCB or circuit ② Lithium All lithium battery socket for Heltec boards is SH1 25 2 ③ Vext 3 3V 500mA output for external devices e g sensors power supply in deep sleep mode Vext can be shut down via software ④ Low Power Products low power design of Whole Circuit the measured data are the current of the system during deep sleep Feature WiFi LoRa 32 is a classic IoT dev board designedproduced by Heltec Automation TM it s a highly integrated product based on ESP32 SX127x it has Wi Fi BLE LoRa functions also Li Po battery management system 0 96 OLED are also included It s the best choice for smart cities smart far