Black & Decker 20-Volt MAX Cordless String Grass Trimmer, Gear Drive, 12-In., Lithium-Ion Battery

20V Max Lithium String Trimmer, Gear Drive Transmission Maintains Constant Speed Won’t Slow Down During Trimming, Automatic Feeding System Improvements, Minimize Overfeeding, Easier To Load The Spool Adjustable Handle, Includes 1 Each 2.0 Ah Battery, 4 Hour Charger, 12″ Swath. For Replacement Battery Use TV #189-554, For Replacement Spool Use TV# 722702.