Patent ID: 7148811

Claim:
A notification device comprising: (a) an activator; (b) one or more primary signal emitters, said one or more primary signal emitters to each emit a primary notification signal upon activation of the activator; (c) one or more secondary signal emitters, said one or more secondary signal emitters to each emit a secondary communication signal upon activation of the activator; (d) one or more receivers capable of receiving communication signals; (e) one or more tertiary signal emitters, said one or more tertiary signal emitters to each emit a tertiary communication signal upon receipt by the receiver of either a secondary communication signal or a tertiary communication signal from another notification device; and (f) one or more quaternary signal emitters, said one or more quaternary signal emitters to each emit a quaternary notification signal upon receipt by the receiver of either a secondary communication signal or a tertiary communication signal from another notification device.