Select And Locks Your Desired Length Within A Versatile Range Of Possible Lengths From Precision Size Of 1mm Up To 18mm. The Philips Qt4050 Is Equipped With Maintenance Free Blades, These Blades Stay Sharp And Need No Oiling, So Your Product Is Always Ready For Use. The Integrated Vacuum Mechanism Absorbs Cut-off Hairs During Use & Gives A Cleaner Washbasin While The Transparent Hair Chamber Tells When To Be Emptied. Strong Lithium-ion Battery For Optimal Power Use And Flexing Guide Comb That Follows Automatically Every Curve Of Your Face For A Precise And Even Trim. Philips Qt4050 Offers Corded And Cordless Use For Maximum Power And Freedom, With The Charging Time Of 8 Hours This Beard Trimmer Can Be Use For Up To 50 Minutes