Feature: 1. CHIP: Built in new original chip that handles all USB signals and protocols. The TTL level is 5V and 3.3V adjustable design, directly draw power through USB connection, no external power adapter is required 2. DURABLE AND BEAUTIFUL PIN HEADERS: Golden yellow appearance, good quality yellow high end pin headers are more durable and beautiful than ordinary black pin headers 3. VARIOUS INDICATORS: Not only the power light PWR, but also possess the TXD and RXD indicators, the reserved RTS and CTS positions are convenient to intuitively know whether the product is working without instrument 4. COMPATIBLE WITH MANY OPERATING SYSTEMS: For Windows 8 and above operating systems, for Linux and for OS X will automatically install the for FTDI driver, but are not compatible with for Chrome OS 5. WIDE APPLICATIONS: Suitable for upgrading set top boxes, router firmwares, mobile phones, game consoles, repairing hard disk firmwares, TTL COM download STC microcontroller programs, communications, etc. Specification: Item Type: USB to TTL Serial Adapter Module Color: Gold Shorting Cap: 3.3V and 5V optional Compatible System: For WINDOWS 98 ME 2000 XP SERVER 2003, for VISTA SERVER 2008, for WIN7, for WIN8 32bit or 64bit. Package List: 1 x USB to TTL Serial Adapter Module1 x Jumper