1) Reasonable price 2)Small QTY can be acceptable 3)Top quality 4)Timely delivery 5)Best after-sale service Description: when someone open door/window,it will sound 16pcs music adjustableuse 3"AA" batterieslow wrong sensor rate Package: Carton size:46*37.5*59.5Quantity/carton:120pcsG.W:14.1kg20",292CTN,35040pcs