RWM150 smoke alarm, extra light, HxWxD 36 x 105 x 105 mm, pure white. Supplied = assembled. Height = 36 mm. Width = 105 mm. Depth = 105 mm. Colour = pure white. Product type = smoke alarms. For use in bedrooms, children's rooms, hallways, etc. Also suitable for use in recreational vehicles (e.g. motorhomes) that people stay in. Recalibration when soiled. The RWM150 optical smoke alarm is suitable for use in bedrooms, living rooms, children's rooms and hallways. It provides a reliable warning about any smoke development and thereby saves lives. It is particularly long lasting thanks to the 10 year battery. The alarm is certified by VdS. It is one of the five best smoke alarms: in its 1/21 issue, Stiftung Warentest awarded this smoke alarm a 'Good' rating.