Worx, 10", Cordless Chain Saw, Boosts The 20V Powershare Platform With Innovative Technology, Patented Tool-Free Auto Chain Tension System Prevents Over Tightening, & Keeps Optimal Chain Tension While Cutting, Combined With An Automatic Oiling System With Indicator, & A Compact Design Allows This Saw To Be Practical In Any Quick Clean Up Or Pruning Task. Battery and charger included.