3 units of ATMEGA328P CH340 Board Compatible with Arduino UNO R3 IDE Whats in the box: 3 Boards new, sealed package. Purchase more than one and save money. The board is the best board to get started with electronics and coding. If this is your first experience tinkering with the platform, the board is the most robust board you can start playing with; it is the most used and documented board. This is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. The board is the first in a series, and the reference model for the platform. Operating Voltage: 5V Input Voltage (recommended): 7-12V Input Voltage (limit): 6-20V Digital I/O Pins: 14 (of which 6 provide PWM output) PWM Digital I/O Pins: 6 Analog Input Pins: 6 DC Current per I/O Pin: 20 mA DC Current for 3.3V Pin: 50 mA Flash Memory: 32 KB (ATmega328P) of which 0.5 KB used by bootloader SRAM: 2 KB (ATmega328P) EEPROM: 1 KB (ATmega328P) Clock Speed: 16 MHz LED_BUILTIN: 13 Length: 68.6 mm Width: 53.4 mm Weight: 25 g