3. Of the product practical. Choose warning apparatus of domestic guard against theft to want to integrate household area, structure the multiple element consideration such as value of tectonic characteristic, property, surroundings, but have a few current referenced standard:
Wired means has news report ability of reliable, interference rejection cost of strong, parts of an apparatus is low advantage, apply to build and can be inside wall the building; of obligate jumper but its maneuverability is poor, disadvantageous the changeful requirement that gets used to user and product, the maintenance to obligate jumper and change difficulty big; of tall, charge
Wireless means can avoid the jumper between probe and lead plane the influence is indoor decorate, have agile, concise advantage, but also exist to accept the external world easily a variety of elements cost of 1000 faze, parts of an apparatus is relatively advanced defect.
Avoiding the measure that enters from the door extremely is mature, use magnetism reed switch to be in charge of namely / the open that magnet explores a door to coming. But should notice to have call the police with delay time immediately two kinds call the police differently spark means, before one kind can produce the spot to call the police instantly, right the person that inbreak can remove block to threaten action instantly, but if before he open the door, the user is like,did not undertake withdraw a garrison is operated, can arise to call the police by accident and reach neighborhood to cause to him user annoy. A kind of delay time sparks after newspaper police type can issue clew news when door open, hint the user that forgets withdraw a garrison undertakes withdraw a garrison is operated in time, if did not receive signal of withdraw a garrison in the lead plane inside proper time, lead plane reentry calls the police all right. Apparent, a kind of means is provided more after practical.
Preventing a thief to enter current and current method from the window is to use passive formula infra-red probe, earlier Chan Jian (use cell of individual heat feeling only) model the element influence such as Yi Shouguang line, air temperature, generation calls the police by accident the false triggering that; suffers the puppy such as mice, cat, dog more easily to cause. Develop gradually later piece multivariate (use cell of many hot feeling) model, reach double ancient bronze mirror (use hot feeling and microwave two kinds of component) model, or 3 ancient bronze mirror (use hot feeling and microwave repass of two kinds of component is odd a machine undertake operation is handled) model the occurence rate that in an attempt to reduces to call the police by accident. This kind of probe calls the police by accident besides easy generation and dawn can be used in the environment indoors only beyond, still a problem restricted his to use in household: The defensive area of this kind of probe is plane of stereo and rather than, when having master activity indoors, cannot have the place troops on garrison duty of whole sealing type to the bedroom.
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