Features: Adopt imported controller RS232 TTL,which can stabilize the flash with high speed 500mA self recovery fuse for protection Two data transmission indicator can monitor data transfer status in real time Reserve 3.3V and 5V pin interface,easy for the DDWRT of different voltage system that need power The entire board is coated by high quality transparent heat-shrinkable sleeve,making the PCB in insulation state from outside, so that the board won't burnt down by material short cut. Electrostatic package,insures the board will not be damaged before use Support WIN7 system Specifications: Dimention: about50x15x7mm Net weight:5g Package weight:15g PL2303HX   Color:Blue(as the picture shows)         USB TO TTL CH340G     Features: Built-in USB to TTL Transfer chip. Designed to be used for USB to TTL electronic projects. TTL interface output, easy to connect to your MCU. Status LED. Dual 3.3V and 5V Power output, work with 3.3v and 5v target device. Size:55mm * 16mm Server 2008/Win7/Win8 32 bits / 64 bits. 1. support WINDOWS 98/ME/2000/XP/Server 2003/VISTA / 2. 3 V3 and 5V by a short circuit risk selection; 3. not only has the power light PWR, there TXD and RXD indicator, whether the product is easy to learn and intuitive to work in the absence of the instrument in the case; 4. high-quality high-grade yellow pin, pin durable than the black market, beautiful; 5. new original CH340G chips, the chips are recommended official USB to TTL chips will not appear due to different driver / different computer as a result of incompatibilities   CH340 module/ USB switch TTL/ USB transfer RS232/ over PL2303/ downloader/ 9 Brush board STC official download chip. Perfectly compatible with all Series MCU will not be because of the different drivers that would lead to problems like PL2303 can not download the program. Ultra-stable.