Welcome to our shop! This USB to TTL Serial Adapter Module is a high-quality and reliable product that can handle all USB signals and protocols. It features a built-in new original chip that ensures accurate and detailed data transmission. The TTL level is adjustable to both 5V and 3.3V, and it can draw power directly through the USB connection, eliminating the need for an external power adapter. The pin headers of this module are durable and beautiful with a golden yellow appearance, making them more visually appealing than ordinary black pin headers. In terms of indicators, this module not only has a power light, but also TXD and RXD indicators. Additionally, it has reserved RTS and CTS positions, allowing you to intuitively know whether the product is working without the need for additional instruments. Compatibility is not an issue with this USB to TTL Serial Adapter Module. It is compatible with various operating systems such as Windows 8 and above, Linux, and OS X. For Windows 8 and above, Linux, and OS X, the FTDI driver will be automatically installed. However, please note that it is not compatible with Chrome OS. This module has a wide range of applications. It can be used for upgrading set-top boxes, router firmwares, mobile phones, game consoles, repairing hard disk firmwares, TTL COM download STC microcontroller programs, and communications, among others. The package includes 1 x USB to TTL Serial Adapter Module and 1 x Jumper. 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.