Professor Shriniwas Rao helped the students develop the 'Rakhi'

This Raksha Bandhan, the city's trees will get their saviour brothers. Six children studying innovative technology as a hobby at a centre in Thane are ready with the prototype of a unique gadget - called Rakhi - that, when tied around a tree, will help to protect it from being felled. If anyone so much as takes a swing at a tree with an axe, the device will immediately send an alert to the forest department along with the location of the tree.