This is a small very compact TTL to RS232 convertor board. You can say it is a breakout board for MAX3232 it is one of the smallest prototyping board around and comes really handy when space is very small. Best of all this module works on 3.3 volt as well as on 5 volts.
Specification of Mini RS232 to TTL Converter Module Board
A converter board for electrical levels
Chip Model: MAX3232
Max. Baud Rate: No more than 120kbps
Operating Voltage: 3V~5V
Four Interface: VCC, GND, RXD, TXD
- Dimension: 15.875mm x 9.398mm x 2.54mm