Espressif ESP32-DevKitM-1 Manual page 3

Key Component
On-board module
5 V to 3.3 V LDO
Boot Button
Reset Button
Micro-USB Port
USB-to-UART
Bridge
ESP32-DevKitM-1 - front
ESP32-MINI-1 module or ESP32-MINI-1U module. ESP32-MINI-1
comes with an on-board PCB antenna. ESP32-MINI-1U comes with
an external antenna connector. The two modules both have a 4 MB
flash in chip package. For details, please see
ESP32-MINI-1U Datasheet.
Power regulator converts 5 V to 3.3 V.
Download button. Holding down Boot and then
pressing Reset initiates Firmware Download mode for downloading
firmware through the serial port.
Reset Button
USB interface. Power supply for the board as well as the
communication interface between a computer and the ESP32 chip.
Single USB-UART bridge chip provides transfer rates up to 3 Mbps.
Description
ESP32-MINI-1 &