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Stay alert with the Smart Door and Window Sensor Alarm Keep your house secure with this smart door and window sensor alarm When a door or window is opened or closed, 10-second alarm will automatically send a message to you Alarm system can emit a sound of up to 110 dB when triggered Simply double click to adjust the volume, or you can turn off the sound WiFi can still send notifications to your mobile phone when sound is off Plastic sensor alarm can be placed in drawer for easy storage Door and window sensor is compatible with app support via WiFi High-quality tape helps you attach the alarm sensor anywhere on the door or window Powered by 2 AAA batteries (not included) Size: 40mm x 10mm x 10mm Save 74% with this Smart Door and Window Sensor Alarm for 11.99 pounds