Look no further. Great product quality， that's solidly built. Best of all， its very affordable price. Buy today.<br />Dimensions: 10*5.4*1.5 cm <br />Microcontroller: ATmega2560 <br />Operating voltage: 5V (USB cable power supply， type B plug)<br />External power supply: 7-12V， recommended 9V <br />Digital input output: 54， 15 of which supports PWM<br />Analog inputs outputs: 16<br />Each I/O port output current: 40mA<br />3.3V pin output current: 50mA<br />Flash memory: 256KB (of which 8KB is used to load the program)<br />SRAM: 8KB<br />EEPROM: 4KB<br />Clock frequency: 16MHZ <br />1 x Board <br />1 x USB cable <br />In anti-static bag<br /><img src="http://img6.eachbuyer.com/x9/p100/eb3780_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb3780_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb3780_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb3780_4.jpg" />