Doberman Security SE-0137-8PK Home Security Window/Door Alarm Kit, 8 Pack (White) 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 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 INCLUDES 3 AG/LR44 Button Cell Batteries for each alarm