Researchers at Nottingham Trent University used old bike parts and a disused pressure cooker to create a wave energy harvester powerful enough to charge a mobile phone.
BSc Product Design undergraduate Owen Griffiths and Professor Amin Al-Habaibeh, a professor of intelligent engineering systems (both pictured above), made it to help people in developing countries with poor access to electricity.
Designed for near-shore use, it can generate 5.6 watts from a regular supply of 20 centimetre high waves, making it capable to power a regular mobile charger.
Owen, 23, originally from Dore in Sheffield, Yorkshire, said: "Many developing countries have a limited electrical network, particularly those like the Philippines which are spread over a number of islands.
"But a small-scale product like this, partly made from reused goods which are widely available, could help provide power to coastal areas."