Specification: Origin: Mainland China Type: Module Condition: New PL2303HX Module: Product Description: 1. using imported RS232 TTL controller. high speed and stable. 2. 500mA self-resuming fuse protection. 3. two data transmission indicator can real-time monitor the data transmission status.  4. reserved 3.3V and 5V pin interface. convenient for different voltage system DDWRT need power.  5. the whole board coated with high-quality transparent heat shrinkable tubing. so that the PCB and the outside in an insulated state. will not burn the board due to material short-circuit.  6. Electrostatic packaging to ensure that the board will not be damaged before use. 7.Support WIN7 system 7. Size: 51x15x8mm/2.01x0.59x0.31inch CP2102 module: Product Details:  1. stable and reliable chipset CP2102 2. in line with the USB specification 2.0. full speed 12Mbps  3. standard USB A-type male and TTL 5-pin pin. 5-pin for 3.3V. TXD. RXD. GND 5V  4. Support from 300bps ~ 1Mbps between the baud rate 5. Communication format support: 1) 5.6.7.8 bit data bits; 2) support for 1.1.5.2 stop bit; 3) odd. even. mark. space. none checksums 6. support for operating systems: WIN7/WIN8/vista/xp/server 2003/200. Mac OS-X/OS-9. Linux 7. USB header for the male. can be directly connected to the computer USB port 8. SMD components for the SMT process production. stable quality 9. Size: 47x15x8mm/1.85x0.59x0.31inch CH340G module: Product parameters: 1. CH340G chip is USB to TTL chip. will not be incompatible with different drivers or different computers! 2. row of pins more durable and beautiful. 3. not only the power light PWR. and TXD and RXD indicators. without the need for instruments can be convenient to intuitively understand whether the product works.  4. 3V3 or 5V power supply can be selected by short-circuit fault selection 5. 3V3 and 5V  5. Support WINDOWS 98/ME/2000/XP Server 2003/VISTA/Server 2008/Win7/ Win8 32 Bit /64 6. Size: 51x18x8mm/2.01x0.71x0.31inch Note: Due to the different monitor and light effect. the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x USB to TTL 1. Superior Quality: This USB to TTL is made from high-quality materials, ensuring stability, reliability, and durability. Its attractive design adds a touch of elegance to your setup. It can be powered by either 3.3V or 5V, making it easy to use. 2. Comprehensive Circuit Protection: With built-in circuit protection, this USB to UART TTL module offers peace of mind while using it. The protection mechanism ensures safe and reliable operation, protecting your connected devices. 3. Wide Compatibility: This USB to TTL board supports a wide range of systems and platforms, making it highly versatile. It can be used in various fields, including electronics, prototyping, programming, and communication applications. 4. Easy-to-Use Interface: The serial communication module features a user-friendly interface, allowing for simple and straightforward connections. Whether you're a beginner or an experienced user, setting up and using this device is hassle-free. 5. Convenient and Portable: This TTL serial module is compact and lightweight, making it convenient to carry and use wherever you go. It is an essential tool for professionals, hobbyists, and enthusiasts who require reliable serial communication.