bad design [SEP] while the concept of the built in comb is a good one this design just does not work well and do not count on the vacuum catching all your clippings because it can only hold about half the volume of a shot glass i ended throwing mine away and switching back to my old oster hair clippers with the snap on combs for my head and bought a small rechargeable waring beard trimmer the twist dial for the comb length on this unit can be wrong i gouged my beard sideburns once with this unit the comb unit must be removed for frequent cleaning and putting it back on correctly takes a delicate touch the large size of the unit and comb also makes it verr difficult to trim your moustache close to your nose do not waste your money