CP2102 USB to TTL MODULE
This is the CP2102 USB to TTL module UART serial converter. This is a great little tool for embedded systems that require a serial connection to a computer. The board can simply attach to a USB bus and will appear as a standard COM port.
This CP2102 USB to TTL Module doesn’t require any external oscillator, it onboard-board voltage regulator, and it even uses a reprogrammable internal EEPROM for the device description. The full hardware UART has flow control for baud rates from 300bps to 921600bps.
This breakout also allows you to connect the TX/RX pins of your favorite microcontroller or serial application to the RX/TX pins of the breakout, creating a simple serial cable replacement.

Supported operating systems:

Windows 98/Me/2000/7
MAC OS-9
MAC OS
X-Windows CE
Linux 2.40 or later
Features:

Brand new and high quality
Included USB transceiver, without external circuit device
Includes a clock circuit and power-on reset circuit
With 3.3V and 5V dual power output
With three LEDs: power indicator, data reception indicator, the data transmission indicator, working status
Meet the USB2.0 specification requirements
SUSPEND pin supports USB suspend state
With self-recovery fuse. In the event of the accidental short circuit, it can effectively protect your computer USB port and Downloader
With reset signal output, etc. directly to the Arduino board Promini download!
Asynchronous serial data bus compatible with all handshake and modulation controller interface signals
The supported data format is 8 data bits, 1 stop bit and parity bits
Connotation 512 byte receive buffer and 512 bytes transmit buffer
Supports hardware handshaking or X-ON/X-OFF