Features 2 adjustable modes. Choose Mode 1 to activate the Patented proximity sensors and Heliball will take off and fly. But it will gently return to the ground unless you place any solid object below it! When you do, Heliball will detect the object (arms, hands, feet, books, even floors) and fly skywards for a moment and then return to the ground again unless you, once more, put something solid closely below it! Mode 2 gives you manual speed and height control using the trigger handset.