1. A new CH340G chips, the chips are USB to TTL chips, does not occur due to different drivers / different computer as a result of incompatibilities.
2. High-quality high-grade yellow pin, and durable.
3. It is 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. 3 V3 and 5V by a short circuit risk selection;
5.  Supporting WINDOWS 98/ME/2000/XP/Server 2003/VISTA /
Server 2008/Win7/Win8 32 bits / 64

Instructions for use

> 3.3 V and 5V choice depending on the actual application environment using the system to select 3.3V 3.3V, 5V 5V system of choice;
> If the driver and wiring are right, the module can not communicate properly,you can swap RXD and TXD two lines to try;
> The simplest module testing methods: TXD and RXD short circuit modules, open the serial debugging tools, just send something, then the module as backhaul module no problem.