The robot weighs only 2.6 grams (0.09 ounces), However it can not stay at one point at the mid air. Their next step to do research to make it hover at one point in the mid air. They have also planned to fit a micro camera with the robot in order to help rescue humans trapped in destroyed buildings during earthquake, search criminals or to probe vehicles on other planets.
This wonderful robot cost about 2.1 million dollars for design and developed. Though this is too costly, the robot seems very amazing in the technology era.