The solar pro duo set is the ultimate solar set, including 2 solar panels of 1.5V each, which may be connected in series for increased power. The panels can be connected directly to the motor or they can connect to the RC handset, powering up the models effectively even from a distance! The greatest advantage of this set-up is the ability to drive models regardless of their position relative to the Sun. The set includes all models from the smaller sets of Solar machines and Solar cars and four more models for advanced building. Printed instructions for all 20 models are included. Features: 307 Parts, 811 Connecting Points.