Equipped with PL - 2303 flash board all performance!  TTL level 5 v / 3 v3 are free to choose.Containing three state light!The MCU upgrade, 9 upgrades, hard disk repair, routing, and so on.  340 module to TTL/USB to RS232 / USB/hold over PL2303 / STC downloader / 9 in flash board on STC officially designated download chip.All perfect compatibility on STC series microcontroller, never like PL2303 scheme will lead to can't download problems because of the different drivers.Super stable. 1, 340 g new original chips, this series of chips is on STC's recommended USB to TTL chips, never appear due to different drive/different computers and other incompatible phenomenon!!!!!!  2, high quality yellow top grade needle, needle than the black line on the market, durability, and beautiful;  3, not only have power lamp PWRS and TXD and RXD indicator light, convenient in the absence of the instrument and intuitive to see whether the product in the work;  4, 3 v3 and 5 v by short circuit at choice;  5, support for WINDOWS 98 / ME / 2000 / XP / 2003 / VISTA/ServerServer 2008 / Windows 7 / doing the 32-bit / 64 6, module size: 55 mm * 16 mm, PCB size: 33 mm * 16 mm;  Shipping list: a 340 flash board