This high-quality product is ideal for securing windows and doors in houses, apartments, mobile homes, offices, hotel rooms, garages, etc. Magnetic sensors detect the presence of windows and doors to prevent intrusions and ensure the safety of children and property. Technical specifications Transmitter dimensions: 9 x 3 x 2 cm Receiver dimensions: 5 x 1 x 1.5 cm Batteries: 2 x 1.5 V AAA batteries per siren (not included) Volume: 100 dB Maximum distance between transmitter and receiver: 10 mm Compatibility and accessories Set of 4 wireless sirens 4 magnetic receivers 8 AAA batteries not included Installation Installing the sirens is very simple and requires no tools or cables. Simply stick them to the windowsill or door frame using the provided adhesive tape. Usage These sirens are practical and discreet. Their white design blends harmoniously with your decor while effectively protecting different areas of your home, including front doors, balconies, gardens, windows, and bedrooms. Additional Information Please ensure that your home meets the requirements for installing a security system to prevent accidental triggering (the distance between the transmitter and receiver should not exceed 10 mm).