Vender Wireless Door Window Magnetic Sensor Detector Alarm Alert Siren for Smart Home House Security al mejor precio

Feature: Alarm sound: 100dB Function: This item is applicable for various doors and windows when illegal intruders invade and the magnetic boxes separated, it will immediately start alarming and warning hosts and threaten the intruders away, could effectively protect your personal property and safety. Operation steps: 1) Open the battery cover, put on the batteries. 2) Put the magnetic box on the right side of the main box, and then turn on the switch to "ON" 3) The item will start alarming when the magnetic box moves away. 4) The item will stop alarming when the magnetic box gets together with the main box. 5) Please make sure two parts close to each other within 1cm, if you are not sure about it, please test it before you peel off the sticker. 6) Please change the batteries when the alarming sound becomes small.