The Freeduino Epic is an Arduino Mega compatible clone with minor differences. It has the same specs, i.e. an ATmega1280 microcontroller with 54 digital I/O's, 16 analog inputs, 4 UART's, power jack, reset button, and an ICSP header. The main difference is it does not have a USB port, but a serial header to be used with an FTDI USB to serial cable. Not putting USB on the board lowers the cost of the board benefitting the buyer. It also does not come with headers for the I/O.