It is a generic card with Wi-Fi connectivity based on the well-known ESP32 (WROOM32). This board does not have an AVR microcontroller, but uses the ESP32 as the main processor. It is fully compatible and programmable with Arduino, but it is much more powerful and works at 240 MHz. It has a microUSB connector for power and programming and can be programmed with the Arduino IDE. Delivered with soldered pins.
Tensilica LX6 240 MHz dual core microcontroller - 600 DMIPS
Wi-Fi 802.11b/g/n HT40 Wi-Fi transceiver, baseband, stack and LWIP
520KB SRAM
Bluetooth dual band (classic and BLE)
4 MByte Flash
Integrated PCB antenna
Ultra Low Noise Analog Amplifier
Hall-sensor
10 capacitive pins
32 kHz crystal oscillator
3 x UARTs (only two are configured by default in the Arduino IDE, one of them used for bootloading/debugging)
3 x SPI (only one set by default in Arduino IDE)
2 x I2C (only one configured by default in Arduino IDE)
12 x ADC inputs
2 x I2S Audio
2 x DACs
PWM/timer input/output available on every GPIO pin
OpenOCD debug interface with 32 kB TRAX buffer
SDIO master/slave 50 MHz
SD-card interface support
Dimensions: 51 x 23 x 8 mm) without header headers
Weight: 6.8 grams
Integrated 3.3V regulator (500mA)
USB connector
4 mounting holes (2.5mm)
RESET button