The WORX WG323 20V Power Share 10" Cordless Chainsaw comes with Auto Tension.

What's Included:

Features:

• [12’ EXTRA REACH] It takes just a few minutes and no tools to attach the pole. And with a reach of up to 12’ and only 10 lbs., you’ll be able to get to branches and limbs before they become a problem.Please refuel before use, but oil is sold separately.
  
• [FAST, CLEAN CUTS] This cordless 20V PowerShare chain saw is as fast and powerful as anything in its class. And with no gas, and no cord, there’s much less muss and fuss
  
• [SAME BATTERY, EXPANDABLE POWER] The same battery powers over 75plus 20V, 40V, and 80V lifestyle, garden, and power tools in the Power Share family
  
• [AUTO-CHAIN TENSION] The automatic, tool-free chain tension system ensures you’ll always have the correct tension for the job at hand
  
• [AUTO-CHAIN LUBRICATION] The automatic chain lubrication system not only makes for smoother, more efficient cuts, but it extends the life of the tool. And the oil level indicator lets you know exactly where you stand
  
• [COMPACT, LIGHTWEIGHT] The saw itself weighs only 10 lbs. You’ll work longer, with less strain on your hands, arms, back, and legs
  
• [PLENTY OF JUICE] These are the same batteries we use on our Jawsaw and in our lawnmowers. They’re powerful enough for those, and powerful enough for a chainsaw

Product Specifications:

• Power Source    Battery Powered
  
• Horsepower    1 Horsepower
  
• Chain Speed    12.5FT/S

Weight & Dimensions:

• Item Weight    10.03 Pounds
  
• Item Dimensions L x W x H    97.5"L x 7.5"W x 9.5"H
  
• Chain Length    10 Inches