Philips Sonicare AirFloss AirFloss HX8211/20 Interdental - Rechargeable, Green, White, 60 s, Ergonomic, White, Built-in, 24 h Philips Sonicare AirFloss AirFloss HX8211/20 Interdental - Rechargeable. Product color: Green, White, Treatment time: 60 s, Handle(s) features: Ergonomic. Battery type: Built-in, Charging time: 24 h, Battery life: 3 week(s). Battery technology: Lithium-Ion (Li-Ion)