Philips OneBlade Pro QP6505/20, Built-in display, Washable, Oil-free maintenance, AC/Baterry, Black, Lime, Silver Philips OneBlade Pro QP6505/20. Minimum hair length: 0.5 mm, Maximum hair length: 7 mm, Control type: Buttons. Product colour: Black, Lime, Silver. Power source: AC/Baterry, Operating time: 60 min, Battery type: Built-in battery