Wireless magnetic door/window alarm, 100 dB, pack of 4

MAGNETIC: The alarms operate using magnetism between the transmitter and the magnetic receiver. The 100 dB siren is triggered when a compatible door or window is opened (triggering distance: greater than 10 mm). EASY: The alarm sensor and magnetic receiver are equipped with adhesive tape. No tools are required; simply stick them to a door frame. TECHNICAL SPECIFICATIONS: Transmitter dimensions: 9 × 3 × 2 cm; magnetic receiver dimensions: 5 × 1 × 1.5 cm. Batteries: 2 AAA 1.5V batteries per alarm (included). Volume: 100 dB. MULTIPLE USES: Enhance the security of your front door, patio or balcony, your bedroom, or your children's room—the 4-pack of alarms and receivers offers a wide range of options. NOTE: Please ensure that your apartment or house has the appropriate conditions for the installation of the security system, without accidental triggering.