Overview: Easily mounted by adhesive tape to window or door. Magnetic sensor switch detects entry, protecting your home or office whether you are in or out. Specification: Door/ Window Magnet Alarm with Chime function Easy instrallation by using double adhesive tape Magnetic sensor for detecting entry Door/ Window open alarm in 90d B Door/ Window open chime function Powered by 3 x LR44 button cells (included) Unit dimension: 6.4 x 4.3 x 2.5cm Unit net weight: 33g In retail packaging Weight Approx:33g Size Approx:6.4 x 4.3 x 2.5