brand new and high quality Material: Electrical components Color: See pictures Description The boot program has been programmed The use of locking for seat, chip replacement easy You can use FT232 USB transfer TTL module, CH340G module, CP2102 module burning program compatible R3 procedures, development environment IDE. Microcontrollers: ATmega328P-PU Operating voltage: 5V IO port logic voltage: 5V Operating current: 500mA (max) Digital I / O Pins: 14 (6 of which provide PWM output) Analog input pins: 6 Clock frequency: 16MHz On-board test indicator, beginners programmable control of the indicator. Onboard power indicator Boot program burning interface: ICSP Program burn interface: GND, 5V, RX, TX, DTR Size: 6.7*3.5cm/2.64"*1.38" Quantity:1Pc Note: Due to the difference between different monitors, the picture may not reflect the actual colorof the item. Thank you!