Philips SHAVER Series 9000 S9031/21, Rotation shaver, Black, SH90, Battery, Lithium-Ion (Li-Ion), 50 min Philips SHAVER Series 9000 S9031/21. Shaver system: Rotation shaver, Product color: Black, Shaving head replacement(s) model: SH90. Power source: Battery, Battery technology: Lithium-Ion (Li-Ion), Operating time: 50 min. Runtime: 50 min, Handle(s) features: Ergonomic