Unmanned aerial vehicles (UAVS), also known as drones, are aircraft either controlled by 'pilots' from the ground or follow a pre-programmed mission. The UAVs have propellers spinning at the end of its eight spidery arms. The drones, which can cost up to Rs 6 lakh each, can fly up to 600 metre in a one-kilometre radius, Yadav said, adding that the drone surveillance will be formally launched by Chief Minister Akhilesh Yadav later this month. These sentinels in the sky have been seen buzzing in several Hollywood movies. No wonder, some cine stars have evinced interest in the launch of the system here and are likely to be present at the launch event, the SSP said. Uttar Pradesh Police had recently used drone cameras in Ayodhya to monitor Vishwa Hindu Parishad's 'Ram Mahotsava' on the occasion of Ram Navami. Drone cameras were used for crowd management and also to monitor activities of people there. Under the police modernisation initiative, a modern control room that manages the 'Dial 100' helpline in the city, has already been set up here. This control room will monitor the drones, the SSP added.