The DFRobot FireBeetle series is the low-power microcontroller deliberately designed for Internet of Things (IoT) projects. The FireBeetle Board - ESP32 integrates a Dual-Core ESP-WROOM-32 module, which supports dual-mode MCU and Wi-Fi & Bluetooth communication. The electric current is only 10μA in deep sleep mode. The main controller supports two power supply methods: USB and external 3.7V lithium battery. Both USB and external DC can directly charge the Lipo battery.