Amazon lists the 21272 as being a single line feed, though the greenworks site lists it as a dual line -can someone confirm for me please?

It is a dual line and you can get replacements by searching for PA66-G30 which is in the spool. Just bought an extra 6 pack on amazon for 9.99.

What is the height of the product?

Don't know exactly (can't get at it to measure right now) but the handle can be extended so it is a comfortable distance so a medium height person can hold it so the bottom (guard and cutting lines) reaches the ground. I would estimate 36 to maybe 44 inches.

Can I purchase string for this and wind it myself instead of buying the prestrung spools? I have done that for years with my Black and Decker trimmer

Yes you can. Winding the sting is not a problem. Putting the spool back into the trimmer is not as easy as your B&D.

I have been seeing reviews that say it's powerful. Does that only apply to the 10 amp or is the 4 amp impressive as well?

The 10 Amp is certainly the more powerful of the two. The 4 Amp is quite adequate for normal household use.

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Greenworks String Trimmer

Product ID: 369608134

Details

Brand
Greenworks
Colour
Green
Cutting width
10 Inches
Item weight
6.2 Pounds
Power source
Battery

⚡20% More Power & 35% Longer Run-Time

🔋24V Lithium-Ion Battery Power

🛠️Compatible with 50+ Greenworks Tools

Description

🌿 Power Your Lawn, Power Your Lifestyle

EXTENDED RUN TIME - Tackle up to 1/4 acre on a single charge with 1.5Ah, 2Ah, or 4Ah battery options.
VERSATILE 24 V PLATFORM - Seamlessly switch between over 50 indoor and outdoor Greenworks tools with the same battery system.
LIGHTWEIGHT ERGONOMIC - At just 6.35 lbs, enjoy effortless maneuverability and reduced fatigue during prolonged use.
3 YEAR WARRANTY PROTECTION - Invest confidently with a comprehensive 3-year tool and battery warranty backing your purchase.
UNMATCHED BATTERY PERFORMANCE - Experience fade-free power with no memory loss after charging, ensuring consistent trimming every time.

The Greenworks String Trimmer is a lightweight, battery-powered outdoor tool featuring a 24V lithium-ion battery that delivers 20% more power and 35% longer run-time. Compatible with over 50 Greenworks products, it offers fade-free performance and supports multiple battery capacities to efficiently manage up to a 1/4 acre. Backed by a 3-year warranty, it’s designed for professionals and enthusiasts seeking reliable, eco-friendly lawn care.

Specifications

ASIN	B086K5HG7F
Batteries	1 Lithium Ion batteries required. (included)
Batteries Included?	Yes
Brand	Greenworks
Color	Green
Customer Reviews	4.0 4.0 out of 5 stars (700)
Date First Available	22 July 2020
Item model number	ST24B214
Manufacturer	Globe
Power Source	Battery Powered
Product Dimensions	100.58 x 10.92 x 24.89 cm; 3.98 kg
Size	11-Inch
Style	24V 2Ah Battery and Charger

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