An alarm device including a sensor having sufficiently high detection sensitivity. The sensor 51 in the alarm device 41 is disposed such that a plane M perpendicular to the detection direction P of the sensor 51 is aligned at a specified angle .theta. with respect to a plane V perpendicular to the sun visor 72 (the lower surface 61a), were the specified angle .theta. should be set to be an approximately mean value of the expected minimum angle .gamma.=0.degree. and the expected maximum angle .ga...

A wireless alarm network which detects smoke or toxic gas or fire or other abnormal environmental conditions within and in the vicinity of a structure wherein the detector at the source of the abnormal environmental condition emits an audible alarm and communicate the abnormal condition to the other members of the alarm network remote from the location of the abnormal condition by coded radio frequency signals. All alarm devices within the network comprise of radio frequency receivers and upon r...

A transmitter comprises a signaling history information transmission unit. After the transmitter generates a detection signal, the signaling history information transmission unit sends corresponding signaling history information to a regular signal transmission unit. From this regular signal transmission unit, the signaling history information and a regular signal are transmitted to a receiver. The signaling history information contains a count value which is updated at every transmission of the...

A door/window/mailbox alarm system comprising a switch, a transmitter unit, a receiver unit and a warning means. A user is reminded to check and close an opened door/window/mailbox by the warning means on the receiver unit which is located away from the door/window/mailbox and in a close proximity to the user's active area such that the user could see or hear a warning signal from the warning means easily. The transmitter unit comprises a timer device that enables the transmitter unit to send ou...

A clock has a face for telling time, a light for illuminating the face, and a switch for controlling the light. The switch cannot be used for turning the light on when the clock is stored. This conserves the clock battery by preventing accidental discharge of the battery when the clock is stored, for example in a suitcase. A magnifying lens is automatically moved to an optimal position relative to the clock face to magnify the face when the clock is deployed to display the time. The magnifying l...

A fire alarm having an electronic evaluator, an optical module, a temperature sensor, and at least one combustion gas sensor, where the electronic evaluator diagnoses one of a plurality of fire types and selects an application-specific algorithm based on the diagnosed fire type. The electronic evaluator uses the signals from the sensors to diagnose at least one of a plurality of types of fire. The fire alarm may have at least one polarization filter which may be an active polarizer with electric...

A battery operated refrigerator alarm having a light sensor for sensing light, a timer, a temperature sensor for sensing temperature, and an alarm indicator. The alarm indicator may have an audio and/or visual indicator. The refrigerator alarm can placed in the refrigerator or mounted to an interior surface or onto a shelf.

The present invention provides an alarm apparatus suitable for use with an object or person, which apparatus is activated upon energisation of the object or person, wherein said alarm apparatus comprises a power source, at least one alarm means, actuating means associated with an unearthed sensor which actuates said alarm means in the event of the energisation of said object or person.

A housing for an alarm includes a base adapted for mounting on a wall, a cover detachably connectable to the base and a sabotage detector for triggering an alarm signal in the event of unauthorized removal of the cover or forcible removal of the alarm from the wall. The base includes a breakaway portion which can be formed as strip-shaped region bordered by weak points. A number of screw insertion points extend through the breakaway portion for fastening the breakaway portion to a wall with one ...

A fire warning device includes detachably connectable shell parts (1,2) which when brought together are mutually united to form a shell or casing (3) which houses a fire sensor (20), alarm emitter (21) and a power source (22). The shell (3) being provided with fire warning device suspension means (8, 9; 16, 17). The suspension means (8, 9; 16, 17) is comprised of a friction anchoring device disposed in the region of the border surface or interface (6) between the two shell parts (1,2) when the s...