Arduino MKR ZERO development board

Arduino MKR ZERO. Processor model: ARM Cortex M0+. Memory clock speed: 48 MHz, Flash memory (microcontroller): 256 KB, SRAM (Static Random Access Memory): 32 KB. Form factor: Arduino, Board type: Compute module. DC current per I/O pin: 7 mA
The MKR ZERO brings you the power of a Zero in the smaller format established by the MKR form factor. The MKR ZERO board acts as a great educational tool for learning about 32-bit application development. It has an on-board SD connector with dedicated SPI interfaces (SPI1) that allows you to play with MUSIC files with no extra hardware! The board is powered by Atmel's SAMD21 MCU, which features a 32-bit ARM Cortex® M0+ core.
Warning: Unlike most Arduino Genuino boards, the MKRZero runs at 3.3V. The maximum voltage that the I/O pins can tolerate is 3.3V. Applying voltages higher than 3.3V to any I/O pin could damage the board.
The board contains everything needed to support the microcontroller; simply connect it to a computer with a micro-USB cable or power it by a LiPo battery. The battery voltage can also be monitored since a connection between the battery and the analog converter of the board exists.

Processor

Processor model: ARM Cortex M0+

Memory

Memory clock speed: 48 MHz
Flash memory (microcontroller): 256 KB
SRAM (Static Random Access Memory): 32 KB

Ports interfaces

USB ports quantity: 1
UART: Yes
I2C interface: Yes

Features

Form factor: Arduino
Board type: Compute module

Power

DC current per I/O pin: 7 mA