FTDI FT232RL USB to TTL Serial Converter Adapter Module 5V and 3.3V 

Features:
The FT232R is a USB to serial UART interface
A low-cost way to add USB capability to For Arduino or other microcontrollers. Use this to give your own breadboard For Arduino USB capability for bootloading or downloading sketches.
RXD/TXD transceiver communication indicator
Includes over-current protection, using a 500ma self-restoring fuse
This board includes a DTR pin needed to auto-reset For Arduino when downloading to your device.

Specifications:
Color: Red
USB Power Supply: 3.3V or 5V
Size:43*17mm
Net weight: 4 g

Package Included:
1x USB to TTL converter