WiFiBoT 4G is a robot which is characterized above all by a great flexibility allowing it to be used in multiple environments and situations. Its mechanical design and its four wheel drive allow this robot to evolve over irregular surfaces or even small obstacles. Its small dimensions and its low weight make it easily transportable and perfect to explore narrow places. As a system, WiFiBoT 4G is opened to all kind of uses and applications. The robot offers an entire world of expansion possibilities at different levels. It features an embedded 400MHz AMD calculator under Linux and a large choice of interfaces like embedded Ethernet, RS232, I2C, USB (optional), as well as standard and mesh WiFi! Its level of standard equipment will allow the users to develop very quickly surveillance and observation applications.