A trio of Indonesian university students has invented a device, that uses high-frequency signals to help locate victims after a natural disaster. Dubbed Detector of Interconnected Position Points or 'Deoterions', the tool emits a ping signal with movement as slight as breathing that can be detected up to 10 km (6.2 miles) away. The signal receiver can be plugged into a mobile phone or laptop, and works with an app available on both Apple and Android systems, the students said.