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Master Lock 4841DATSEN Auto Sentry Wireless Anti-Theft Vehicle Alarm System | 
| Brand: Master Lock
Category: Automotive Parts and Accessories
List Price: $146.67
Buy New: $83.72
as of 9/7/2010 14:18 CDT details
You Save: $62.95 (43%)
Seller: Amazon.com
Rating:  3 reviews
Sales Rank: 34091
Color: N/A
Media: Automotive
Shipping Weight (lbs): 0.9
Dimensions (in): 6.4 x 5.6 x 3.1
MPN: 4841DATSEN
Model: 4841DATSEN
UPC: 071649063152
EAN: 0071649063152
ASIN: B001CI0KFO
Shipping: Eligible for FREE Super Saver Shipping
Availability: Usually ships in 24 hours
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| Features:
| • | Detects shock, glass break, and voltage drop, Siren mounts anywhere under the hood with double-sided tape | | • | Alarm attaches to battery terminal and sensor plugs into VPA or accessory socket | | • | Protects your vehicle and its contents, pressure sensor detects unauthorized vehicle entry into passenger compartment of cars and trucks | | • | Installs easily in minutes with no tools or splicing, no wires to cut | | • | 110 decibel alarm siren and includes 2 fobs |
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| Editorial Reviews:
Product Description
Auto Sentry- Wireless Anti-Theft AlarmAs the worlds largest manufacturer of padlocks and portable security products, Master Lock has set the standard for quality and selection for more than 80 years. Building on this tradition, Master Lock continues to expand its commercial products and services to better meet our customers changing security requirements. Trust Master Lock for the innovative products, security, support and service you need.Protects your vehicle and its contentsPressure sensor detects unauthorized vehicle entryInstalls easily in minutesNo wires to cut110 decibel alarm sirenIncludes 2 fobsRetail plastic packaging
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| Customer Reviews:
 Bad directions July 21, 2010
Glen Roy Balko (Dallas, TX, US)
Have not used the product yet. That said, the instructions are very poor. A 3 pin device and instruction to only hook up two of the pins. The 3rd pin is labled 'ignition'. what would you do with it, wrong it is a test pin and not used. Rest of the instructions are just as bad.
 Very good noisemaker theft deterrent. February 19, 2010
Gary (Antelope, CA United States)
Great little alarm and loud enough to get everyone's attention.
I am completely satisfied with this product and plan to buy two more.
If only it was 2 ways ;) July 5, 2009
A. Soror (Ontario, Canada)
3 out of 3 found this review helpful
Update 16/11/2009: Died in October 2009 for no apparent reason. Luckily enough I got it replaced and will give it a second chance, the new one is working as of November 2009 and I will update the review if anything unaccepted happens.
Update 18/07/2010: Replacement still gong strong (knock on wood)
A products that does exactly what its supposed to do. :)
I have had it (2-3 months ago), and couldn't be happier.
Reasons behind the purchase:
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- I didn't get it to deter any theft attempt, we all know that if any needs to get into a car, he will be in, out and away before the $5xx viper draws enough attention.
- Any ways, the reason I bought this was because of a couple "hit and run" I had during the past year, lousy drivers denting/scratching the side of my parked car at the grocery parking lots and just leaves. I installed this for the hope that it draws someones attention just enough to get the plates of the offender.
Bang for buck:
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Even the most basic installation for a conventional alarm, that's without hocking up the windows, power locks or installing a hood/trunk sensor would cost at 2-3 times the price of this unit.
If you don't want the car to be driven away, then an immobilizer is the way to go, again costs so much to install. although same company has a brilliant idea about remotely activated starter relay. Master Lock Starter Sentry Vehicle Anti-Theft System
Oh, not to mention the $4 yearly discount on vehicle insurance. ;)
Security:
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And for those asking "if someone has broken into your car, what's to stop them from unplugging the sensor and throwing it out the window? Or popping the hood and ripping the alarm away from the battery?"
Here is what I think:
- Once triggered the siren wouldn't stop without the fob unit unless disconnected from the battery.
- This alarm should be triggered by any voltage drop as well.
- Can't we make the same "rip the alarm away from the battery" about any other more pricier alarms ?
Convenience:
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If you know the way around your car (that how to connect/disconnect your battery wires) it would take around 10-15 minutes. If its your first time under the hood, I would give it a 30-45 minutes max.
Setting Sensitivity:
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One more issue is how to set the sensitivity, there is a useless side screw on the sensor, forget about it. The proper method is posted on masterlock's website.
Taking the test:
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I have a Camry'99, which I can claim a bigger than typical car, sensor in the cabin is a pressure sensor, it highly depends on how big is your car. By default it didn't fully work for my Camry (just banging the front doors used to trigger it), after fob sensitivity setting opening my trunk would trigger it.
At highest sensitivity setting, I can't even get it to arm if its raining, because the sensor senses the droplets on the body of the car (tells you about how sensitive it is), medium sensitivity should work no problem.
Cons:
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Why is it losing a star ? first documentation is as good as non existing, especially on how to set the sensitivity. Second, this would be perfect is it was 2 way (fob beeps to let you know alarm was triggered).
Final thoughts:
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This is a variable sensitivity, cabin pressure sensor that lives to the promise. Better know what to expect rather than getting disappointed.
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