Smart Alarm: if it detects smoke, the smoke detector alerts you on site via alarms and on the app when you’re out via push notification on your smartphone Reduced false alarm rates: false alarms caused by natural household dust and dirt are minimised thanks to the integrated dust compensation feature Replaceable battery: smart smoke detector with 3 volt lithium battery with a service life of up to 5 years Activation of the sirens in a break-in: simultaneous use of the smoke detector as part of the alarm system as an indoor siren which warns you in case of a break-in and scares off intruders Maximum added value in the system: you need a Bosch Smart Home controller or Bosch Smart Home controller II to integrate the device into your Bosch Smart Home system Box contents: 1x smoke alarm II, 1x 3 V lithium battery, material for screw-mounting and adhesive-mounting, 1x installation instructions