| Car Alarm Remote Start Starter Keyless Entry Ht800d | 
| Brand: HT
Category: Photography
This item is no longer available
Sales Rank: 12,912
Media: Electronics
MPN: HT800D
Model: HT800D
UPC: 853322002005
EAN: 0853322002005
ASIN: B002L2Q3BU
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| Features:
| • | car alarm + remote engine starter + keyless entry :With advanced ASK technology, high-sensitivity and anti-jammin | | • | Compact remote control | | • | Dual-stage shock sensing, reduce false alarm. | | • | Emergency alarm :If any of the doors, hood or trunk is open while the alarm is armed, the siren will sound for 25 sec, | | • | Car finder. Remote trunk release. Anti-hijacking. Automatic door lock/unlock. |
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| Editorial Reviews:
Product Description
A car alarm is an electronic device installed in a vehicle in an attempt to discourage theft. Car alarms work by emitting high-volume sound (usually a siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination thereof) when triggered or when circuit is breached.
Car alarms can be designed to be triggered by vibrations, tilting o f the car (to prevent unauthorized towing), touching the car, the opening or closing of special switches (e.g. door contacts), sensing small but rapid changes in battery voltage (which might indicate an interior light going on, or the ignition circuit being activated), or using volumetric sensors such as ultrasound , infrared or microwave.
Many times a car alarm can be triggered accidentally. This may be caused by the passing of large trucks, the vibration of thunder or people coming into contact with the vehicle, triggering the alarm sensors. Some sensores may need adjustment in order to prevent false alarms.
Since many car alarms are triggered accidentally, most people in American cities are numbed to the sound of alarms, and do nothing to prevent theft. The New York City Police Department claims that car alarms are actually making the crime problem worse (see their booklet called "Police Strategy No. 5: Reclaiming the Public Spaces of New York," City of New York, New York, 1994) because nothing is done about the alarms, the general impression is that no one cares about the neighborhood.
Because of the large number of false alarms with car alarms, many vehicle manufacturers no longer factory fit simple noise-making alarms, instead offering silent-but effective?
-article from wikipedia-
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