Droplet manipulation has important applications in areas such as heat management, water harvesting, and chemical reactions. A research team from City University of Hong Kong (CityU) developed a multi-functional electrostatic droplet tweezer that can precisely "trap" liquid droplets and remotely guide their motion on flat and tilted surfaces, and in oil mediums. Experiments showed that the tweezer can manipulate droplets of different volumes and with different components. It has potential applications in areas such as high-throughput biological and chemical analysis.