The BV 50A-H has a backpack with a 50-cc Honda engine and connections to easily use flex shafts and hybrid heads from its HMS internal vibrator system. Ideal for elevated decks and structural slabs, the backpack features a shoulder-mounted on/off switch and throttle control with a quick disconnect system for a fast change of shafts and heads. Features ergonomic design with a custom-built harness pad and integrated back support belt. Wacker Neuson.