Editorial Product Review:Item Description:12V rechargeable battery features automatic feed spool that advances .065 line as needed. No bumping. Patented gear drive with 9' cutting swath; converts to an edger with a twist of the collar. Lock-off button prevents accidental start up. 12V rechargeable battery includes charger. Unit weight: 7 lb.
Amazon.com Item Description:The Black and Decker 9-inch 12-volt cordless string trimmer and edger is a lightweight (7 pound), powerful and easy-to-use cordless string trimmer and edger. It features a 9-inch cutting width and features the exclusive Automatic Feed Spool (AFS) system that automatically advances the cutting string as need using centrifugal force, so no bumping is required. This cordless string trimmer has a powerful 12-Volt battery that works with a gear-driven motor to allow you to easily power through heavy weeds, grass, and overgrowth. The battery is rechargeable, gives you plenty of run-time per charge, and comes with a wall-mounted charger for convenient overnight charging. This cordless trimmer/edger is very quiet, effortless to start, and requires no gas, oil or tune-ups. The Groom'N'Edge head rotates 180 degrees to convert the trimmer to an edger and back again in a matter of seconds. Used as an edger, the flip-down edge guide assists with edging along sidewalks and driveways. A secondary handle adjusts for increased comfort and control. A lock-off switch prevents accidental start-ups to ensure safe usage every time. A 30 day no-risk satisfaction guarantee and full 2-year warranty are provided.
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Buyer Reviews
Average Buyer Rating:
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Best thing since sliced bread!~
I was determined to do away with the electric cord and this fills the bill. Much, much easier to use even though just a little heavier than the corded ones. Not having to move the cord every few seconds, tripping on it, stepping over it, etc. makes this thankless job almost fun. All my usual sources were sold out of this model. Thank goodness for Amazon.com!
Customer Rating: -
Great For My Needs
Power lasted about 15 or 20 minutes. Trimmer is easy to start and the automatic line feed is a real plus. Works well for my purposes and did a good job, but if you have a lot of trimming to do, this is not for you.
Customer Rating: 
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Do not buy !
This item has a pathetic running time on a fully loaded new battery, approximately 10 minutes. This is insufficient for my yard, and most likely for most yards. This is not mentioned anywhere on the box/user manual, and I wish I had checked out reviews of this product before buying.
I will definitely bring it back to the store for a refund.
Do not buy it unless you have a very small yard, you cannot trim much in 10 minutes....
Customer Rating: -
cordless trimmer
Ok, the first one I received did not have the internal fixtures to charge the unit. I called B/D and they had to send me a label to mail it back to them. They were nice enought and send one to me before they received mine back in the mail.
I had arranged the delivery to be able to use it after a vacation. That did not work.
Then I get the new one and charge it up and it keeps running out of battery life. I have a very small yard. I can not complete the front yard before the battery runs out and have to wait until the next day to complete it. Then, a third day to do the back yard. This is not what I expected.
Disappointed, YES!