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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🌿 Cut smarter, not harder — the ultimate edge for your lawn game!

SEAMLESS LINE FEEDING - Automatic Feed Spool technology means no bumping, no interruptions—just smooth trimming.
DUAL FUNCTION VERSATILITY - Easily switch from trimmer to wheeled edger with a simple rotation for precision edges.
ERGONOMIC COMFORT CONTROL - Lightweight design with adjustable handle and height for fatigue-free yard work.
STAY CONNECTED STAY SAFE - Cord retention system prevents accidental unplugging so you keep your flow.
POWER THROUGH WEEDS EFFORTLESSLY - 6.5 amp motor delivers relentless cutting power for pristine lawns.

The BLACK+DECKER BESTA510 String Trimmer combines a powerful 6.5 amp motor with innovative Automatic Feed Spool technology to deliver uninterrupted trimming. Its 2-in-1 design easily converts from trimmer to wheeled edger, while ergonomic features like adjustable handles and a cord retention system ensure maximum comfort and safety. With a 14-inch cutting path, this lightweight, corded electric tool is engineered for efficient, professional-grade lawn care.

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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Color	black
Style	String Trimmer
Power Source	Corded Electric
Included Components	(1) BESTA510 String Trimmer(1) AF-100 Spool(1) Auxiliary Handle(1) Guard
Batteries Included?	No
Brand	BLACK+DECKER
Manufacturer	BLACK+DECKER
Item model number	BESTA510
Product Dimensions	21.59 x 12.4 x 95.5 cm; 2.86 kg
ASIN	B077Z78YQX

BLACK+DECKER BESTA510 String Trimmer

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