The British-designed Lounger, a chair that uses powerful magnets to float in the air, in an undated photo. The 'Star Wars' inspired hover chair, a 125 mph electric motorbike and hi-fi speakers that cost as much as a small house are among the attractions at Britain's biggest gadget show in London this weekend. (Stuff magazine/ Handout/Reuters)Reuters - Gadget makers showed off their green credentials at a technology show in London on Friday to try to tempt consumers worried about soaring fuel bills, climate change and the financial crisis.