Is this one that has replacement blades?

No it doesn’t have replacement blades. It has multiple shaver heads you just oil them occasionally. I really like it.

Waterproof? The 7440 says it waterproof whereas this model doesnt say anything about it. So is this waterproof? Water resistant?

Water proof! Never had an issue in the shower

What is Metal T-blade and Metal U-blade used for?

I don't know what those are. But the instruction booklet explains them.

What is the height of the trimmer while on the charger?

About 7 inches with the basic trimmer head. But if you have one of the comb attachments, it will add some more height, depending how high you have it dialed in.

ASIN	B0BV3CCF44
Batteries Are Required	Yes
Best Sellers Rank	#79,615 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #181 in Nose & Ear Trimmers #271 in Hair Clippers
Blade Material	Stainless Steel
Brand	Braun
Colour	Multicolour
Country of Origin	USA
Customer Reviews	4.3 out of 5 stars 1,814 Reviews
Global Trade Identification Number	00069055137222
Hair Type	All
Included Components	Battery, Clipper
Item Dimensions	16.6 x 8.3 x 28.5 Centimeters
Item Weight	595.13 Grams
Manufacturer	Procter & Gamble
Material	Stainless Steel
Model Name	Series 9 9440
Other Special Features of the Product	Cordless
Power Source	Battery Powered
Recommended Uses For Product	Beard, nose, ear, body, face, head, moustache, bikini line, armpit, back, neck, eyebrows
Target Audience	Men
UPC	069055137222
Unit Count	1.00 Count
Usage	Beard trimming, Body grooming, Hair clipping

Braun All-In-One Style Kit Series 9 9440, 13-In-1 Trimmer For Men With Beard Trimmer, Battery Powered Body Trimmer For Manscaping, Hair Clippers & More, Braun's Sharpest Blade, 40 Length Settings,

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