http://www.ebay.es/itm/Arduino-Uno-Atmega328P-PU-R3-REV-3-Cable-USB-Version-Compatible-D1/221409432836?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D14%26meid%3D6687845735528392996%26pid%3D100015%26prg%3D1006%26rk%3D1%26rkt%3D10%26sd%3D271409117757%26clkid%3D6687846944217129483&_qi=RTM1685972
WCH CH 340 at the little chip next to usb connection