The present invention provides solid pharmaceutical compositions for improved delivery of a wide variety of pharmaceutical active ingredients contained therein or separately administered. 5-10 wt %, and one or more conductive fillers selected form: carbon nanotube 0. The DA \u03c0-conjugated polymers have space-charge limited zero field hole mobilities of at least 1\xd710\u22126 cm2V\u22121s\u22121. The BS estimates the distances between the BS, the RS and the MS using the propagation delays, and controls transmission power according to the estimated distances. Typically, when the time-out threshold is decreased, it is decreased by a significantly smaller amount that the amount by which it is increased, when it is increased. A pump element is configured to pump fluid to and from the fluid slot through the recirculation channel.