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Quiet security mode. This mode assumes the complete absence of sound signals in the event of an alarm. In models with one-way communication (see "Type of communication"), the warning is usually carried out by light signals (flashing headlights), with two-way notification sent to the key fob or other device. Anyway, the silent mode can be very useful when extra noise is undesirable — for example, at night, when a siren could disturb people around.
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Silent setting / disarming. The ability to silently turn on and off the security mode, when the alarm reports a change in the operating mode only by light signals or notifications on the key fob (or other control device). This function will be very useful if you need to keep quiet (for example, at late hours of the day or early in the morning), or if you do not want to give others (including possible intruders) unnecessary signals about the state of the machine.
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Automatic arming. Possibility of automatic arming of the alarm system. Usually, this happens after the ignition is turned off and all doors are closed. The meaning of this function consists of two main points. Firstly, it reduces the likelihood of forgetting to turn on the armed mode and leaving the car unprotected. Secondly, automatic arming eliminates the need to once again give signals from the key fob and makes it difficult for intruders trying to
...read the signal using a scanner.
— Arming delay. The ability to delay the automatic arming of the car (see above) for some time — usually within a few minutes. This feature will be especially useful if, after getting out of the car, it often becomes necessary to return to it — for example, to pick up some things.
— Security with the engine running. The ability to arm the alarm when the car engine is running. This feature can be very useful if you need to go away, leaving the car unattended, and it is undesirable to turn off the engine — for example, if it is turned on to warm up before an urgent trip.
— Security of the perimeter. Perimeter protection provides protection against illegal entry into the car: an alarm system with this function is able to respond to door openings, and in the case of using additional limit switches (see “Supplied Contents”), also to opening the hood and/or boot. In this case, the signal can be triggered not only when opening directly, but also when trying to open.
— Blocking a stolen car (Anti-Hi-Jack). The ability to block the engine or control in case of theft or forceful seizure of the car. The specific implementation of this function may be different. For example, some alarm models provide protection against robbery: if the driver's door is opened with the ignition on, the timer starts, and if after a while the driver does not turn off the Anti-Hi-Jack (by pressing a hidden button, entering a code, or in another way that is not available intruder), the system blocks the car. In other models, the activation of this function can be carried out remotely — for example, by a signal from a mobile phone. Also, blocking can be accompanied by other actions of the system — for example, turning on a siren or locking doors to detain an intruder.
— Disarming in two stages (AV). When using this function, to completely disarm the car, you need to send a command from the control device twice: the first command unlocks only the driver's door, and the rest open only when the button is pressed a second time. In this way, protection is provided against thieves — “purse holders” and other intruders who can enter the car through doors that are not controlled by the driver.The number of additional channels provided for in the design of the car alarm. Each individual signaling channel is used to connect and control certain equipment. The main channels of the system are considered to be those that initially have a certain “specialization”: for example, one channel controls the siren, the second controls the headlights, the third controls the engine start, the fourth controls
the boot opening, etc. However, in addition to them, additional channels can be provided that do not have specialization and are used for very diverse purposes, at the choice of the owner — for example, to control the heating of the passenger compartment or the rear window. The number of such channels in modern car alarms can reach eight; you should pay attention to this parameter if you want to connect equipment to the system that is not provided for by specialized channels.
