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