1、Stable Performance: The module adopts the original FT232RL chip, which has stable and reliable performance. Through the actual test, the baud rate can reach 3Mbps, but the user's actual transmission rate may be limited by the serial port software. 2、Wide Compatibility: This USB A to TTL serial port module supports a wide range of operating systems, including for OS X, for Linux, for Android, for Wince, for Win 7 8 8.1 10 and so on. 3、Voltage: The module supports 3.3V and 5V external power supply, and also has TTL level setting function, which can meet the voltage requirements of different devices. 4、LED Indicators: Three LED indicators are designed, including a red POWER LED and two green TXD LEDs and RXD LEDs. these LEDs can help users to identify. 5、12M Crystal Oscillator, Pin: With external 12M crystal oscillator, and use Bit Bang function for more stability. Chip integrated internal crystal oscillator (default). Pin definitions are CTS, RTS, RXD, TXD, GND and VCC. Item Type: USB A to TTL Serial Port Module Material: PCB Main Chip: FT232R Support System: For OS X, For Linux, For Android, For Wince, For Win 7 8 8.1 10 USB Interface: 2.0 Pin Definition: CTS, RTS, RXD, TXD, GND, VCC Baud Rate: 300bps To 3Mbps 1 x USB A to TTL Serial Port Module 1 x Jumper Wire 1 x Instruction Manual