A few days ago, Swedish scientist Asian Institute launched the world's first water-activated charging device - PowerTrekk charger. The charger is based on the development of micro-fuel cell technology, which can use ordinary water to extend battery life, its power up to 3 watts. PowerTrekk is a portable fuel cell that provides a direct source of fuel power and an energy buffer. It can be compactly connected via USB with a cellphone. When ordinary water is poured into its small, disposable metal discs, the hydrogen is released and combined with oxygen into chemical energy which is eventually converted into electricity that produces electricity iPhone's battery charge saturation rate is between 25% and 100%. The introduction of the charger is one of the strategic measures that fuel cells have gained widespread acceptance in society as a whole. Robot has been used widely in modern industry. With the deeply urge for automation in sanding field, robot has been a smart mehtod to realize grinding automation. Our Constant Force Actuator connects with robot, can work in grinding polishing sanding, high working efficiency, low cost and cleaning working environment. More and more manufacturers choose this method to realize automation reform. grinding use robot, robot use in grinding, robotic grinding machine DARU Technology (Suzhou) Co., Ltd. , https://www.darudfc.com