Advantage : Deft,convenient,and affordable . 1. It can be put away anywhere 2.It has a separate power supply box 3. It have a ventilation(Wind Machine ) 4.The transmission speed can be adjustable 5 .Its exterior size : Length 1220 mm ,Width 460mm,Height 1030mm 6.Its effective size : 335 mm 7. Its parameter : 220 V, 1KW , with two lamps .