Amazon has filed a patent to develop drone propellers that could tell people to 'watch out'
The ecommerce giant is interested in using drones to deliver parcels to people's homes and offices, cutting out delivery companies like FedEx and DHL.
Spotted by The Register on Thursday, the patent filing has two elements to it.
One involves using drone propellers to alert people on the ground of the drone's presence, possibly by shouting phrases like "watch out" at them.
The patent reads:
A diagram in the patent shows that Amazon also thinks it would be possible to use LEDs in/on the propellers to convey messages like "Hi."
The other element involves developing drones with noise-cancelling propellors rotating in different directions. In the patent, Amazon gives an example of a drone with two propellors, stating that one would generate lift, while another could cancel out noise.
The patent reads: