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credit-card machine generally run around HK$165

20% of ad returns to the drivers

cause drivers to lose about five cents per kilometer

These strange-looking planes carry a wealth of sensors in their bulbous noses: colour and black-and-white TV cameras, image intensifiers, radar, infra-red imaging for low-light conditions and lasers for targeting. They can also be armed with laser-guided missiles.

Each multi-million dollar Predator or Reaper system comprises four aircraft, a ground control station and a satellite link.

Although drones are unmanned, they are not unpiloted - trained crew at base steer the craft, analyse the images which the cameras send back and act on what they see