DOBERMAN SECURITY Door & Window Alarm with Chime SE-0101C-4PK - Unique Ultra-Slim Design Fits Sliding Windows (Silver/Black) DETECTS VIBRATION, GLASS BREAKAGE, AND DOOR ENTRY/EXIT  A simple, effective, affordable way to deter theft UNIQUE ULTRA-SLIM DESIGN  Perfect for sliding glass doors and windows; fits on virtually all windows and doors to protect your home, apartment, dorm, or office DUAL TRIGGER TECHNOLOGY + OPTIMAL SENSITIVITY  Magnetic & vibration sensors double your level of home security; sensitivity settings are adjusted perfectly to prevent false alarms due to minor vibrations. EASY INSTALLATION  Simply peel and stick, no tools needed. Warning sticker on backside deters theft;INCLUDES 3 BUTTON CELL BATTERIES (LR44) Superior adhesive backing for optimum sticking power