sound signalling

A sound signalling device, such as a whistle, is also required by law.

The alarm features a circuit board assembly and a sound signalling device.

As an emergency sound signalling device, the FOX 40(R) can be carried on a key chain.

In addition to a sound signalling device in the canoe or raft, each person should have a water-resistant whistle permanently attached to their lifejacket.

Under water, the world of sound signalling takes on an additional significance since sound in water travels much further than light, moving a great deal faster than it does in air.

In addition, all boats operating without a coach boat must carry on board the mandatory Coast Guard Safety Equipment, a life preserver for each rower, and a sound signalling device.

Description of Goods Musical boxes, fairground organs, mechanical street organs, mechanical singing birds, musical saws and other musical instruments not falling within any other heading of this Chapter; decoy calls of all kinds; whistles, call horns and other mouth-blown sound signalling instruments.