Patent ID: 8773249

Claim:
A car alarm apparatus comprising: a first horn provided in a car; a second horn provided in a place inaccessible from an outside of the car; an electrical source that supplies power to the first horn and the second horn; a theft detection section that detects an occurrence of a theft of the car; a horn switch that receives an operation of an operator; a first relay closed when the horn switch is operated; a first fuse connected to the electrical source in series with the first relay and the first horn; a second fuse connected to the electrical source separately from the first fuse; and a second relay connected to the electrical source in series with the second fuse and the second horn, the second relay including: a first contact, which connects the second horn to the electrical source through the first fuse and the first relay, in parallel with the first horn, wherein said first contact is closed when electrical conduction to the first horn occurs so that both said first and second horns sound; and a second contact that connects the second horn to the electrical source through the second fuse and that is closed when an occurrence of the theft is detected and the first fuse is blown by the theft so that said second horn sounds only.