Why do some have holes in the back and others do not?

Different manufacturers, make their products, in different ways and sometimes the same company may make them in different ways. It's may not be an exact science in the manufacturing of this particular item.

How many do you need on a vehicle?

I’m not sure exactly how many but I have six on my vehicles. I have 2 on each side in the front, 2 below each passenger door and 2 on each side in the back.

Are they permanent? How often do i need to replace? How do you know if they are working?

I live in kentucky and have alot of deer around, it seems like they work I see alot of deers on the side of the road standing there not moving , I have had then on the car for about 4 months and they have stayed on

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Frienda 8 Pieces Deer Whistle Save a Deer Whistles Avoids Collisions, Deer Whistles for Car Deer Warning Devices Animal Alert for Cars and Motorcycles

Product ID: 407443767

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Description

Specifications

Manufacturer	Frienda
Brand	Frienda
Item Weight	2.39 ounces
Package Dimensions	5.91 x 4.33 x 0.83 inches
Item model number	Frienda-Deer Repellent-58
Manufacturer Part Number	Frienda-Deer Repellent-58

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