The BT Smart Controller is the heart of this ROBOTICS construction set. Although you cannot see them, the Controller module has a number of electronic components. The interplay of these components with your computer and a control program allows you to control the models in the ROBOTICS BT Smart Beginner Set. Here, some more technical information:
The Controller has four inputs (I1-I4) for connection of sensors (mini-switches, phototransistors), two outputs (M1-M2) for connection of actuators (motors, lights), an LED as operation indicator, a DC jack for connecting a power supply unit (9 VDC), two connecting sockets for a 9 V battery tray or rechargeable battery pack, and a mini-USB connection for data transmission from the PC to the Controller as well as a Bluetooth 4.0 interface for wireless transfer of data between the control and PC or tablet. The frequency band is 2.402 GHz - 2.480 GHz, with a maximum radiated transmission power of 1.37 mW.