This module is a WiFi communication module. It can be used to communicate with a PC or a smart phone. Me WiFi can even be a WiFi Hotspot.
 
Features:
Long communication distance
2.54mm pin holes for connecting with Dupont wire
Easy wiring with 6P6C RJ25 interface
Arduino library for easy programming

Specification:
Rated Voltage: 6V - 12V
Rated Current: 1.5A
Frequency: 2.4GHz