What is the fine-grained topic of the following text: BRIGGS & STRATTON 725EXI 163cc OHV Handle any mowing conditions with this all-wheel-drive mower The Husqvarna LC221AH features an exclusive system that automatically shifts between two and four wheels and locks the front and rear differentials— no buttons or levers needed. Only return the topic.
Husqvarna LC221AH all-wheel-drive mower features and system