Wonder if this would work to force neighbors to turn down TV/stereo system so don't wake up w/severe or migraine headache at 4am every day

It's a loud horn, but it might not be loud enough to make them shut off their TV/stereo. An air driven horn might be more effective. But maybe you should just have a nice calm talk with them during the day when tensions wouldn't be so high.

How loud is the SeaSense blaster horn compared to the type safety whistle used on boats

The blaster horn is plenty loud for a personal horn--loud enough to bother the people near you, but it surely would not be as loud as the warning horn on medium-sized to larger boats. I don't know that much about boats, as I am pretty landlocked, but there are surely boats and boat horns in many sizes and strengths and pitches.

The product dimensions disclosed on Amazon seem HUGE (9x5x3). Is this device really that large? That sounds like the size of a large eggplant.

Those dimensions almost seem like the box size. I'd say a soda can is 2.5" diameter and 5" tall. This item is about 1.5" diameter and 5" tall -- approximately since I don't have mine in front of me to measure.

I have COPD and can only blow like a 91 yeard old man, and Im only 81. Think I could get enough air to make a sound?

I am 63 I have asthma, chronic bronchitis and a touch of emphysemia, which means I also have COPD. I had metastatic cancer to both lungs and had half of my left lung remove and part of my right lung removed. I sure can not blow up a balloon.My situation does not sound as bad as yours however. The trick to blowing this is to get the part into the right configuration. I you do that you would be able to blow it. It does not make enough noise however. If you needed something to call for help from any distance more than 20 feet this is probably not going to help you. I am giving you a link on amazon for a product that makes more noise and you only have to push a plunger in. http://www.amazon.com/SUPER-BLAST-Hand-Pump-Horn/dp/B0083CMKK0/ref=sr_1_1?ie=UTF8&qid=1404315885&sr=8-1&keywords=manual+air+horns. Hopes this helps.

ASIN	B0019LY8HK
Automotive Fit Type	Universal Fit
Best Sellers Rank	#208,509 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #84 in Boat Safety Horns
Brand	SeaSense
Customer Reviews	3.8 3.8 out of 5 stars (477)
Date First Available	October 1, 2001
Exterior	Polished
Global Trade Identification Number	00737765740628
Is Discontinued By Manufacturer	Yes
Item Weight	2.4 ounces
Item dimensions L x W x H	5 x 2 x 1 inches
Item model number	50074062
Manufacturer	Unified Marine, Inc.
Manufacturer Part Number	50074062
Model	SeaSense SAFETY BLASTER
Noise Level	115 Decibels
OEM Part Number	50074062
Product Dimensions	5 x 2 x 1 inches
Style	Modern
UPC	737765740628

SAFETY BLASTER

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