China is now apparently using public address systems mounted to drones to warn citizens about personal protective measures to help protect public health:
	
	
		
			
				
					
						 
					
				
			
			
				
					
						
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				Watch China use 'talking drones' to warn citizens amid coronavirus outbreak | CNN
Officials in China have started using drones equipped with speakers to warn citizens to wear masks as coronavirus continues to spread in the country.
				 
				
		 
			 
										 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
  
  
  
  
  
  
 
		