This USB to TTL bridge is a module, base on CH340 series USB-TTL bridge, and it is a budget solution for connecting micro-controllers and other digital serial devices to PC. Direct access driver support is available www.wch.cn for the latest application notes and product support information for the CH340G. This board uses 5V signal levels by default. Also tolerance for 3.3V logic level signals. Board have power out for DC 5V and 3.3V. With limit of currency 500mA.