Adjustment to make the operate more flexibly. 6pcs high power LED, fan-cooled LB-603 Teeth whitening accelerator1.New-style structure and unique form, compact and elegance2.Double handles, drag type arm, multi-angles, drag type arm, multi-angle adjustment to make the operate more flexibly.3.Unique semi-circular head design,both arches whitened at the same time4.6pcs high power LED, fan-cooled5. ...