High quality brand new CH340G chip, this series of chips is the STC official recommended USB to TTL chip, will not appear due to different drivers/different computers and other incompatibility phenomenon!!!TTL level 5V/3V3 optional(3V3 and 5V are selected by jumper). Including 3 status lights! Single chip upgrade, medium 9 upgrade, hard disk maintenance, route upgrade and so on preferred.There are PWR, TXD and RXD indicator lights. It is convenient to know whether the product is working directly without instruments;Support WINDOWS 98/ME/2000/XP/Server 2003/VISTA/Server 2008/Win7/Win8 32-bit / 64-bit. Driver--cable.cc/download/U2-079.rarCH340G modules /USB to TTL/USB to RS232/ over PL2303/STC downloader/medium 9 swipe board STC officially specified download chip.Perfectly compatible with all series of STC microcontroller, will never be as PL2303 scheme because of different drivers can not download the problem. Super stable.