Besides the battery is there any reason to purchase the 7155 versus the 3053? Is having a more powerful motor helpful for longevity? Is it noisier?

7155 is the queitest garage door opener I have ever had the pleasure of owning. Ours came from Costco on sale for $179.99, $194.84 with tax in Texas. Home Depot installed for $77. Took installers all of 30min, with me asking questions. Worth every penny, you won't be sorry. Battery, Wifi and smartphone access is just the cherry on top.

Does this have metal or plastic gears?

The gears are plastic and if you don't let the belt go out of adjustment to loose I don't see a problem with them being plastic I have had my opener a stealth belt drive for 6 months and works like a champ now I'm buying one for my Father to replace his worm drive old as the hills opener motor finally gave out but it was a loud opener

Is this genie 7155 soft start soft close??

Yes with the right spring tension and the start and stops programmed nice and quiet and soft not herky jerky

This is for a 7 feet garage door. Where can I purchase an extender to make it 8 feet?

To make the Genie QuietLift Door Opener operate an 8 foot tall garage door, you will also need to purchase: Genie GEN39026R Garage Door Opener Extension Kit for 5-Piece Belt-Drive Tube Rails, one size, Metallic

ASIN	B07SKCGMY7
Best Sellers Rank	#208,506 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #67 in Garage Door Openers
Brand	Genie
Brand Name	Genie
Color	Black/White
Colour	Black/White
Customer Reviews	4.4 out of 5 stars 4,753 Reviews
Exterior Finish	White
Exterior finish	White
Global Trade Identification Number	00050049021818
Included Components	Includes a 1 1/4 HPC smart belt drive garage door opener with battery backup, two pre-programmed 3 button garage door opener remotes, wireless keypad, multi-function wall console, safe-t-beam system, detailed programming and installation instructions,.
Installation Type	Screw-In
Item Dimensions L x W x H	49.3L x 12.7W x 12.7H centimeters
Item Type Name	Smart Garage Door Opener with Battery Backup
Item Weight	0.01 Pounds
Item weight	0.01 Pounds
Manufacturer	GENIE
Manufacturer Warranty Description	Limited 5 Year Parts, Limited Lifetime Belt Warranty, Limited Lifetime Motor Warranty
Material	Plastic
Material Type	Plastic
Product dimensions	49.3L x 12.7W x 12.7H centimeters
Recommended Uses For Product	Residential garages, quiet operation, smart home integration, battery backup, voice control, In-Garage Delivery, easy installation
Specification Met	UL325 Compliant
UPC	050049021818
Unit Count	1 Count

Genie StealthDrive Connect Model 7155 TKV Smartphone Controlled Ultra Quiet Strong Belt Drive Garage Door Opener, Wi Fi & Battery, Backup Works with Amazon Alexa & Google Assistant, Black/White

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