Digital I/O The digital input/output terminals are 0~13 in .Analog I/O The analog input/output terminals are 0~5.Support ISP download function.Input voltage: No external power supply is required when connecting to the computer USB, the external power supply is 5V~9V input.Output voltage: 5V output and 3.3V output.Controller: ATMEGA328PAnalog input pins: 6 (2 of which can be used as I2C interface)Digital IO: 14 (6 of which can be used as PWM ports)Flash memory capacity: 32KB (2KB of which has been used as Bootloader space)USB power supply voltage: 5VSRAM: 2KBExternal power supply voltage (recommended value): 7~12EEPROM: 1KBExternal power supply maximum current: 1AClock frequency: 16MHzIO port maximum current: 40mAOperating voltage: 5VSize: 75 x 54 x 15mmMaterial: PCBcolour: bluePackage Contents:1 x Development Board1 x Pin HeaderOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.