DOBERMAN SECURITY Door & Window Mini-Alarm &ndash; Compact Design Fits on All Doors and Windows &ndash; Powerful 100 dB Alarm OR Chime &ndash; Features Long Battery Life &ndash; Perfect for Home, Office, Dorm Room or Even RVs &ndash; Model SE-0129 MAGNETIC TRIGGER TECHNOLOGY  Loud 100 dB alarm alerts you of potential break-ins and when someone enters the door of a house/room or office (select from alarm or chime sound) STURDY, COMPACT DESIGN - Detects entry and fits on any door or window  perfect for home, office, dorm room, garage or even RVs EASY INSTALLATION  Simply peel and stick, no tools needed PERFECT FOR YOUNG & OLD  Safely prevent young children or wandering elderly from leaving the house Batteries - 4 x LR44/AG13 button cell batteries (Included) Superior adhesive backing for optimum sticking power