Does this trimmer require a two-prong or three-prong power supply?

You can use a three prong extension cord. It only fits one way though. So if it doesn't fit flip it over and the cord should plug into the trimmer.

What is the process for line replacement?

When replacing the line, use only 0.065 inch (1.65mm) diameter round line. Other diameters or shapes may degrade performance or cause damage to the trimmer. Unplug trimmer. Remove the empty spool from the trimmer. Remove any remaining cutting line from the spool. Make a fold at the end of the cutting line at about 3/4 inch (19mm). Feed the cutting line into one of the line anchoring slots. Insert the 3/4 inch (19mm) end of the bulk line into the hole in the spool adjacent to the slot. Make sure the line is pulled tight against the spool. Wind the cutting line onto the spool in the direction of the arrow on the spool. Make sure to wind the line on neatly and in layers. Do not crisscross. When the wound cutting line reaches the recesses, cut the line. Fit the spool and cap onto the trimmer.

What type Of spool do it use

It's just called AFS Automatic Feed Spool with 0.065in line. Works great!

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BLACK+DECKER Weed Wacker with Auto Feed, 14-Inch 2 in 1 String Trimmer Lawn Edger, Powerful 6.5-Amp Lightweight Electric Weed Eater (BESTA510)

BLACK+DECKER Weed Wacker with Auto Feed, 14-Inch 2 in 1 String Trimmer Lawn Edger, Powerful 6.5-Amp Lightweight Electric Weed Eater (BESTA510)

Product ID: 60479795

Details

Brand
BLACK+DECKER
Color
Orange Black
Cutting Width
14 Inches
Item Weight
6.3 Pounds
Power Source
Corded

⚡6.5 Amp motor power

🔄2-in-1 trimmer & wheeled edger

🛡️Automatic feed spool tech

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NT$5825

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Description

🌿 Cut the chaos, own the edge — power meets precision in one sleek tool!

STAY CONNECTED STAY FOCUSED - Cord retention system prevents accidental disconnections so you never lose momentum.
NO INTERRUPTIONS JUST RESULTS - Automatic feed spool technology eliminates bumping, keeping your workflow smooth and uninterrupted.
POWER THROUGH WEEDS LIKE A PRO - 6.5 Amp motor with POWERDRIVE transmission delivers relentless cutting power for the toughest overgrowth.
LIGHT AS A FEATHER STRONG AS STEEL - Weighing just 6.3 lbs with adjustable handle and height for fatigue-free, ergonomic control.
SEAMLESS SWITCH ULTIMATE PRECISION - Effortlessly rotate from string trimmer to wheeled edger for flawless lawn borders and sidewalks.

The BLACK+DECKER BESTA510 is a lightweight yet powerful 14-inch corded electric weed wacker featuring a 6.5 Amp motor and innovative automatic feed spool technology. Its 2-in-1 design easily converts from string trimmer to wheeled edger, delivering professional-grade trimming and edging with ergonomic comfort and a secure cord retention system. Trusted by thousands, backed by a 2-year warranty, and made in the USA, it’s engineered to keep your lawn looking sharp without the hassle.

Specifications

ASIN	B077Z78YQX
Best Sellers Rank	#1,635 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #12 in String Trimmers
Brand Name	BLACK+DECKER
Color	Orange, Black
Customer Reviews	4.4 4.4 out of 5 stars (17,295)
Cutting width	14 Inches
Global Trade Identification Number	00885911535021
Included Components	(1) BESTA510 String Trimmer(1) AF-100 Spool(1) Auxiliary Handle(1) Guard
Is Product Cordless	No
Item Dimensions L x W	8.5"L x 4.88"W
Item Type Name	String Trimmer
Item Weight	6.3 Pounds
Manufacturer	BLACK+DECKER
Manufacturer Part Number	BESTA510
Manufacturer Warranty Description	2 Year Limited Warranty, 30 Day Money Back Guarantee
Model Number	BESTA510
Number of Items	1
Pattern	Solid
Power Source	Corded Electric
Required Assembly	No
Size	One Size
Speed	8000 RPM
Style Name	String Trimmer
UPC	885911535021
Unit Count	1.0 Count

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