The Orbis Intrinsically Safe (I.S.) TimeSaver Base has been designed to make installation fast and simple. The terminal screws are captive screws and will not fall out of the terminals. The base is supplied with the screws unscrewed in order to avoid unnecessary work for the installer. If it is required that all detectors are fitted with their LEDs facing the same direction, the bases must be fitted to the ceiling observing the marking on the exterior which indicates the position of the LED.