Build fabulous motorised models with this new snap fit construction set which connects in any direction and anglesupplied with a high torque motor with forward and backward motioneasy to follow building instructions with access to the engino stem online library and an extraction tool for the smaller parts for easy disassembly make this a fabulously thorough more 039engineering style039 kit than many of the more 039toy like039 construction kits on the marketrequires 2aaa batteri