Burglar alarm system for electronic machine such as notebook computer, personal digital assistant, etc.

摘要

The radio receiver (20) accommodated in slot of electronic device receives signal from transmitter through receiving antenna and a decoder. The alarm device in receiver is controlled by the controller such that alarm signal is output when no signal is received by radio transmitter. A security switch is controlled to turn ON or OFF the radio receiver. The radio transmitter has transmitting circuit which outputs code signal through encoder to radio signal transmitter when control device is turned ON.