Specification: Adopt Lexin's ESP32 chip 32-bit dual-core, 240MHz frequency Integrated WiFi and Bluetooth LoRA wireless communication 0.49 inch OLED screen The main processor is completely free to run the user application. An additional ULP coprocessor that monitors GPIOs, ADC channels, and controls most of the internal peripherals. 802.11 n (2.4GHz), speed up to 150Mbps Bluetooth v4.2 full standard, including traditional Bluetooth (BR/EDR) and Bluetooth Low Energy (BLE) Input power: USB, lithium battery Output power supply: +5V (only when USB is powered), +3.3V Integrated lithium battery charging circuit Using an external power supply controlled by IO port, it is convenient for the development board to enter low power consumption LoRa: Using Semtech's SX1276 chip Supports 433MHz - 470MHz band optional Interface: UART, SPI, I2C, I2S, Mirco SD card 12 - bits ADC, 8 - bits DAC 29 general GPIO ports Storage: FLASH: 64M-BitsMB Power consumption: Sleep current: 800uA Package Included: 1 x DollaTek ESP32 Wireless Stick SX1276 Development Board ( Not soldered pins+pin stickers)"