The creation of a sensor that operates without batteries. In the management of infrastructures such as buildings or bridges or for assisting individuals deprived of the sense of hearing with vital technologies like gadgets, sensors are currently being extensively used in various significant applications. 

However, these sensors rely on batteries due to the continuous need for power supply, necessitating their regular replacement and accumulating electronic waste on a large scale.

According to a research study in the European Union, it is estimated that by 2025, 7.8 billion batteries will be discarded daily in waste bins. These batteries are made of materials that can be challenging to collect and dispose of properly.

Recently, scientists from Switzerland have claimed to develop a sensor that can eliminate the hassle of dealing with batteries.

A recent study at ETH Zurich, Switzerland, suggests that the researchers have created a mechanical sensor that does not require energy to operate and could help reduce battery waste.

One of the research leaders, Johann Robertson, explained that this sensor utilizes the vibrational energy present in sound waves.

The sensor is capable of operating specifically on certain sounds (such as the articulation of a particular word or the occurrence of a specific sound). The sensor is triggered by the set of vibrations caused by sound waves, indicating that the sensor has become active.