It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. The Osoyoo UNO Board is fully compatible with Arduino UNO rev.3, it is a microcontroller board based on the ATmega328P ( datasheet). The UNO is the most used and documented board of the whole Arduino family.” - Overview If this is your first experience tinkering with the platform, the UNO is the most robust board you can start playing with. “The UNO is the best board to get started with electronics and coding.