Me USB Host is an adapter for USB devices. You can use it to connect a Makeblock mainboard to a USB device, such as a USB joystick, a mouse, or a thumb drive. So you can control your robot with your own joystick or something else.
The Cobra Line Follower Array provides 4 X QRE1113 IR reflectance sensor mounted on a 9mm pitch Each sensor is comprised of two parts - an IR emitting LED and an IR sensitive phototransistor. When you apply power to the VCC and GND pins the IR LED inside the sensor will illuminate.