The Smart Indoor Siren is designed to team with the Netatmo Smart Indoor Camera to keep your home extra secure. Your Netatmo Smart Indoor Siren automatically sounds its 110-decibel alarm when the Smart Indoor Camera detects an intruder. The wireless Smart Siren comes with a variety of pre-recorded sounds such as dog barks and other home noises to make intruders think there is someone at home. The Siren can also alert you when someone tries to disable it. You receive an instant notification on your smartphone while your Indoor Siren sounds the alarm. Leave home with complete peace of mind. Features: Automatic 110-decibel alarm when an intruder is detected Alarm System arms and disarms itself automatically Install it in minutes. Simply download the app and follow the instructionsAdd the Indoor Siren to your Netatmo Smart Indoor Camera for a complete security system that protects your home. The Siren only works with the Indoor Camera, sold separately. Specifications: Includes Smart Indoor Siren only Product Size: 130 mm (diameter) x 35 mm (depth) / 5.1 in (diameter) x 1.4 in (depth)Colour: White Guarantee: 2 Years Warranty Battery-operated or hardwired through microUSB cable (not included)Includes 4 AA batteries with 2-year lifespan (already inserted in the product) and 1 mounting kitThe Smart Indoor Siren only works with the Netatmo Smart Indoor Camera, sold separately. It needs to be installed indoors, in the same room as the Camera. Maximum 1 Siren per CameraiOS 10 minimum required/ Android 5.0 minimum required Model Number: NIS01-UK