· Qauv yooj yim, yooj yim rau nruab ib lub paj ntaub yog consummate, seem precision, yig thiab tswv yim;
· Rooj nrov toughened iav dawb;
· Uas hloov vents ntawm lub thawv;
· Yuav nruab ib lub casters thiab txhawb taw;
· Ib qho yooj yim raug tshem tawm ntawm lub sab laug thiab sab xis qhov rooj thiab qhov rooj es rear;
· Daim ntawv qhia txog kab kev los ntawm accessories yeem.