DIYmall ESP32-PICO-KIT V4.1 Mini Development Board ESP32 ESP-32 WiFi Module with Male Pin Header

Standard ESP32-PICO-D4 module soldered to the ESP32-PICO-KIT V4 board. The complete system of the ESP32 chip has been integrated into the SIP module, requiring only external antenna with LC matching network, decoupling capacitors and pull-up resistors for EN signals to function properly.　
LDO
5V-to-3.3V Low dropout voltage regulator (LDO).
USB-UART Bridge
A single chip USB-UART bridge provides up to 1 Mbps transfers rates.
Micro USB Port
USB interface. It functions as the power supply for the board and the communication interface between PC and ESP32-PICO-KIT V4.
5V Power On LED
This light emitting diode lits when the USB or an external 5V power supply is applied to the board. For details see schematic in Related Documents.
I/O
All the pins on ESP32-PICO-D4 are broken out to the pin headers on the board. Users can program ESP32 to enable multiple functions such as PWM, ADC, DAC, I2C, I2S, SPI, etc. For details please see section Pin Descriptions.
BOOT Button
Holding down the Boot button and pressing the EN button initiates the firmware download mode. Then user can download firmware through the serial port.
EN Button
Reset button; pressing this button resets the system.
here following options are available to provide power supply to the ESP32-PICO-KIT V4:
Micro USB port, this is default power supply connection
5V / GND header pins
3V3 / GND header pins
Package Includes:
1 X ESP32-PICO-KIT V4 Mini Development Board
Document link http://esp-idf.readthedocs.io/en/latest/get-started/get-started-pico-kit.html#get-started-pico-kit-v4-board-front