Suddenly it occurred to me that Radek was using it as a warning device.

Other police alleged the man had been attempting to research and design a laser missile- warning device.

Armalite radar-used as proximity warning device for aircraft.

It was a warning device, the driver explained, to tell him he was exceeding the speed limit.

I think it acts as a warning device to rogue taxi drivers who want to take me on.

Police said the man helped so-called Islamic State (IS) develop a laser warning device to help warn against incoming missiles.

An earlier reconnaissance mission found that the Germans had pegged out live geese along the sector to act as a warning device.

The use of dazzlers described in the report ranges from the straightforward -as a nonlethal warning device -to the more far-out.

Sean comes up with the idea of wearing a light bulb around his neck as an early- warning device, but only Natalie follows suit.

A perimeter check turned up no other guards or trip wires or jury-rigged warning devices.

Yet, where safety engineers saw obvious benefits to the collision- warning devices, a new set of researchers saw problems.

You see, the "soldier-portable visual threat warning devices" would also tap directly into the soldier's brain.

A US-based tsunami expert is urging New Zealand to install deep sea warning devices off the east coast of the North Island.

The green lasers are growing in popularity among militaries as warning devices and as a tool to temporarily distract or disorient a potential aggressor.