A light-emitting material comprising a conjugated polymer and a blue-light emitting perylene. The vacuum cleaner can further include a battery lid, which includes the at least one battery receptacle, and which is arranged above the filter cover, the battery lid being transferable from a closed position in which it covers the filter cover to an open position in which a user has access on the clean space side to the filter cover, and vice versa. A sub-latch circuit stores a logic value as sub-latch data and is responsive to a sub-latch signal to selectively flip the logic value of the sub-latch data according to the voltage level of the bit line. The Fourier transform component transforms a stream of digitized samples of the received multiplexed communication channels from the time to the frequency domain using the alignment determinations made by the selected components on the receive path. In another embodiment, the process selects one of four elongated patterns based on the orientation of a predicted motion vector.