What is the working principle of car alarm?

[ Pacific Security Network News ]
Car alarm works
In an ordinary electronic car alarm device, there is an integrated chip with some switch gates. When a trigger voltage is applied, the switch door opens to output a positive voltage to the drive circuit, inferring the actuator and the alarm circuit.
The applied voltage is accomplished by sensors or switches and is concealed and non-destructive.
The electronically controlled cars are generally the original anti-theft devices. The principle is basically the same as that of the electronic anti-theft devices, but the circuits are implicated in each other, mainly the locking and starting system.
In addition to the enhanced function of the electronic anti-theft device, the network anti-theft device can also send the thief to the owner's mobile phone and has the ability to lock the engine. Its mobile phone positioning can position the vehicle within a certain range.
The GPS satellite positioning anti-theft function is even stronger, and it integrates almost all the anti-theft functions, and can be accurately positioned within 5 meters by the satellite, which is the front. Its sensors are wirelessly sensitive and hard to break. The above is the working principle of the car alarm device introduced by the Pacific Security Network.

Residential Sectional Garage Door

A typical version of an overhead garage door used in the past would have been built as a one-piece panel.The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism. Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers. The door is balanced by either a torsion spring system or a pair of extension springs.A remote controlled motorized mechanism for opening garage doors adds convenience, safety, and security

• Aluminum garage doors are low-cost, light, rust-proof, and feature low-maintenance. They are prone to denting because aluminum is not strong and they are energy-inefficient since aluminum is a highly conductivematerial.

• Fiberglass and vinyl garage doors are composite units, combining a steel core behind a fiberglass or vinyl skin. They have also polyurethane insulated base sections, or other type of foam insulation. These premium doors can match steel garage doors, and be a realistic imitation of wood (namely fiberglass units), but they may be more expensive than steel units.

• Steel doors have become common and are available in a variety of sizes and styles, provide strength and security, are cost-competitive, and may have optional insulating value. Extra strength is available with two or three layers of galvanized steel with a low gauge number (23-24 gauge steel panels).

• Wood garage doors offer aesthetic appeal, but they are high-maintenance and may be expensive. Low-priced wood garage doors may warp and break easily.

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