This is USB to TTL 3.3V 5.5V  Serial Adapter Module based on FT232RL IC, It is mainly used for arduino applications.
 
 
Features of FT232RL IC:-
Single chip USB to asynchronous serial data transfer interface.
Entire USB protocol handled on the chip. No USB specific firmware programming required.
Fully integrated 1024 bit EEPROM storing device descriptors and CBUS I/O configuration.
Fully integrated USB termination resistors.
Fully integrated clock generation with no external crystal required plus optional clock output selection enabling a glue-less interface to external MCU or FPGA.
Data transfer rates from 300 baud to 3 Mbaud (RS422, RS485, RS232) at TTL levels.
128 byte receive buffer and 256 byte transmit buffer utilising buffer smoothing technology to allow for high data throughput.
 
 
Features of FT232RL USB TO TTL Module:-
 
Material: PCB + Electronic Component
Support 3.3V, 5V
Main Color: Red
Chipset: FT232RL
USB power has over current protection, using 500MA self-restore fuse
RXD/TXD transceiver communication indicator
Pin definition: DTR,RXD,TX,VCC,CTS,GND
Pitch:2.54mm
Module Size: About 36mm(length)*17.5mm(width)
Interface : Mini USB
 
* Product Images are shown for illustrative purposes only and may differ from actual product.