Input voltage: USB 5V, from computer, power bank or standard USB adapter
3.3V, 500mA (maximum) voltage regulator
0-5V outputs with 3.3V-compatible inputs
x14 digital I/O pins (6 PWM outputs)
x6 analog inputs
6-pin ISP header
32k flash memory
16 MHz clock speed
R3 shield compatible
On-board programmable push-button (pin 2, must be configured as INPUT_PULLUP)
Integrated piezoelectric buzzer (pin 8)
LEDs for 5V, 3.3V, TX, RX and all digital pins
Power supply via USB Micro-B
Dimensions: 69.3 x 61 mm x 10.5 mm
Complies with CE, FCC and RoHS standards
Comparison Arduino UNO vs Maker UNO Plus
Maker UNO Plus is fully compatible with Arduino, allowing you to share the same library and code. Compared with the originalArduino Uno, Maker UNO Plus adds 12 LEDs, a piezoelectric buzzer and a programmable push-button. Current is increased from 3.3 V to 500 mA from 150 mA to support more 3.3 V devices. As for the power supply, the DC plug has been removed and replaced by a USB Micro B port.