[Features]Notifies you of a fire with a loud two-stage sweep sound of approximately 90 dB and a clear, easy-to-understand voice alert.Equipped with a non-slip surface on the top, making installation even easier.In addition to the sensitivity adjustment function, the alarm automatically determines fire conditions according to the installation environment.· Notifies you of a fire with a loud, easy-to-understand two-stage sweep sound and a clear voice alert.· Built-in battery with a 10-year lifespa