This is a CP2102 based USB to Serial TTL module with 6 Pin connector includes DTR signal. This CP2102 Module is a new and improved design which gives you the option to use all the signals of CP2102 IC. Module has two power option 5V and 3.3V. Power and RX TX line LED is also provided. Best design module for breadboard Arduino as it can reset micro controller using its DTR signal.