Hi,im searching a outdoor ro

Hi, im searching a outdoor robot all terrain with caterpillar or with 4 big wheels (with 4 servo-motores), with camera (with IR lights) that can see on my computer or mobile phone on a app, and that can control it with a joystick/control command or by mobile/PC with any interface control/app. Communication by wifi/Wlan, long battery life (lipo) that can easily remove to change for a new battery already charged on a IMAX B6 for example. Not very big and not very small about 30cm of lengh. Speed velocity about 10 to 15cm by second. Need a kit that can be easily to mount it, with a budget no more than 300. thank you