This robust but economical seven-piece kit lets you demonstrate the conversion of energy between different forms. It includes four devices for generating electrical energy from mechanical motion (hand generator), chemical energy (batteries), light (solar cell) and wind (windmill) and three devices for using electrical energy to generate light (LED) motion (motor) and sound (buzzer). A set of connecting cables is included for hooking up the devices to each other in appropriate combinations. Includes manual. Weight (2 packages): 1.33 kg. Height of windmill: 25 cm.