Child Safety Seat Ease of Use Ratings


Are All Seats Safe?
All car seats rated by NHTSA meet Federal Safety Standards & strict crash performance standards. While all rated seats are safe, they do differ in their ease of use in four basic catagories:


Evaluation of Instructions

Vehicle Installation Features

Evaluation of Labels

Securing the Child


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Diono Monterey 4DXT (B)



Manufacturer  /  Model NameDiono Monterey 4DXT
Model Number  /  Manufacture Date10834-US-01  /  Jun 1, 2019
Harness TypeHighback/No Back
Weight  /  Height40lb - 120lb / 38" - 63"
Evaluation of Labels 1 stars
There is no diagram overview of the different methods of installation for this seat (highback/no back) on the labeling. The seat belt path is not completely labeled. The warning against using a lap-only belt does not explicitly state that a lap-only belt may not be used.
Evaluation of Instructions 2 stars
The instruction manual was attached in a hard-to-find location when the car seat was removed from its packaging. The instruction manual storage location may be difficult to find and cannot be accessed while the child is secured in the seat. No complete illustration of a child in the car seat is shown next to height/weight information. A warning against using a lap-only belt is not found in the belt routing section.
Securing the Child 5 stars
There are no illustrations given on the car seat to show conversion from highback mode to backless mode.
Installation Features 5 stars
Overall Ease of Use Rating 3 stars

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