1. Onboard digital microphone, support image recognition and voice processing 2. The onboard 40 PIN GPIO interface can be connected to the HAT module to adapt to IoT applications 3. Onboard lithium battery charging and boosting chip, supporting battery charging and discharging and USB power supply 4. Compatible with and ESP-IDF software , seamlessly connected with ESP-WHO application. Onboard 8 MB 5. PSRAM, 4 MB FLASH memory, and supports SD expansion. Onboard USB to UART chip CP2102, convenient for serial port debugging and downloading 6. There are 4 LED indicators on board, which is convenient to check the running status of the module WiFi standard: 802.11b/g Bluetooth standard: Bluetooth 42, including traditional Bluetooth (BR/) and Bluetooth Low Energy () Processor: Xtensa LX6 dual-core processor @240MHz SRAM: 520KB+8MB Flash memory: 448KB+4MB Input voltage: 33V-5V Working voltage: 33V Charging current: 1A@5V Machine current consumption: 7.7mA@5V (ESP32 deep sleep) type:B: without camera Working temperature: -40~85C Colour:blue Material:ABS Size: 6.5 x 3.5cm Package Contents: 1 x ESP32One Development Board 1 x USB cable(type A male port to -male port ) 1 x Screw bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.