It uses unique new idea of "block off+alarm=double security", when open windows, it can lock the window through lock body and slot, when voice ringing, also don't let thief get it, to avoid to see the thief face to face, protect your family and property, let you have a good dream. It also can have caution and protection when the children climbing the window.

Packing:
Carton size: 47*27.5*42.5 cm(36pcs, 14.5kg)