B.One Siren: B.One Siren has a rechargeable battery.
B.One Open/Close Sensor: Battery can be removed and replaced by a new one. Polarity is indicated with bat + and bat -. Please check the physical sensor to see the notation.
B.One Motion Sensor: Battery can be removed and replaced by a new one. Polarity is indicated with bat + and bat -. Please check the physical sensor to see the notation.