1)Dinglisoundproofwindowsareinstalledinyourexistingwindowsafterthesecondlineofdefense;2)withoutremovingyourexistingwindows,windowreplacementeliminatestheconfusioncausedbytheindoorenvironmentandinconveniencetoalotoftrouble;3)Installthequick,30-40minutestoinstallawindow.Withoutcausingmessyhomeenvironment;4)push-pullswitchleftandright,donottakeupinte...