Multi-functional warning device

The utility model relates to a multi-functional warning device. The working circuit of the utility model is composed of an anti-theft signal detecting circuit, a toxic combustible gas detecting circuit, a warning time display circuit, a warning circuit, a rectification voltage stabilizing circuit, a standby power supply and a human body infrared induction indicating circuit. The human body infrared induction indicating circuit comprises a main return circuit, a power supply circuit, a probe head inducing circuit, an operation amplifying comparison circuit, a control circuit, an oscillating circuit and an optical control circuit. The utility model has the multi-function that the anti-theft function is realized, the emergency help is realized, the warning action can be realized when the leakage of toxic combustible gas happens, and the warning time can be displayed. When the utility model is used, the light source can be automatically provided when a user enters the room at night; besides the aural warning, the light ray stimulating function can be generated when a person enters the room illegally. The alternating current and the direct current can be adopted by the utility model at the same time. The utility model has the advantages of economical effect and practical effect.