Hair cutting device

A hair cutting device kit including a detachable cutting unit actuator, and user-moveable control element. The cutting unit has an extension mechanism configured to vary a cutting length of the cutting unit within a cutting length range. The actuator is configured to cooperate with the extension mechanism of the cutting unit to vary a cutting length of the cutting unit, the actuator being moveable between a first actuator position corresponding to a first extreme cutting length, and a second actuator position corresponding to a second extreme cutting length. The control element is moveable between a range of length control positions between a first control position corresponding to the first actuator position and a second control position corresponding to the second actuator position, and an off position corresponding to deactivation of the drive. The actuator is in the first actuator position when the control element is in the off position.