This wireless photoelectric smoke detector connects back to your watchguard 2020 base station so you can be informed immediately via text message, phone call or via the app on your mobile smart device if smoke is detected within the detector chamber. It sends wireless signal up to 100m away and one smoke detector can monitor a 20m2 area. This detector can also be used as a stand alone unit using the built in 85dB alarm siren. The alarm is powered by one 9V battery and has a built in test button and a low battery indicator. Comes with a 12 month warranty.