Braun BeardTrimmer BT3322, AC/Battery, Black Braun BeardTrimmer BT3322. Minimum hair length: 0.0197" (0.5 mm), Maximum hair length: 0.394" (1 cm), Control type: Buttons, Rotary. Product color: Black, Blade material: Stainless steel. Power source: AC/Battery, Operating time: 180 min, Battery type: Built-in battery