背後の筒状パーツ(バッテリー)をオミットし、代わりに大型化した臀部にバッテリー機能を内蔵し、様々な意味で汎用性を増したモデル。
This model has increased versatility in many ways by omitting the tubular parts (battery) in the back and instead incorporating the battery function into the larger buttocks.