astral battery controllers are available in 1 and 2 gang versions and should be used in dry indoor locations only. They are supplied with a wall mounting bracket to enable them to be mounted either to a flat wall surface or over an existing BS wall box. A battery controller can provide on/off control over switches and in addition, on/off and dimming control over dimmers to operate together as a group. Alternatively it can be used to control a scene where the user configured light levels are recalled to set a required lighting mood.