Students design their own robots, build them, and program and activate them. This set of 541 pieces includes all kinds of technical parts you need including EV3 programmable brick, color sensor, ultrasonic sensor, button sensor and gyroscope sensor. You can find building instructions and schedules for the inspirational sample robots that you can build with the basic set and the basic set + extra parts set in the EV3 software. Rechargeable battery for EV3 programmable brick is included in the box contents. In order to charge the battery, you need to purchase the charger adapter, which is linked below.