An electrical hand-held device with proximity detection can be placed on a surface and has at least one transmission electrode, at least one reception electrode, and at least one compensation electrode between the transmission and reception electrodes. The V-shaped cross -section of each cassette can herein be defined by two walls and a bridge piece located therebetween, wherein each wall has a number of cut-away portions. The active struts are configured to produce a force to steer the plurality of momentum actuators and the platform to produce forces and moments for spacecraft attitude control and disturbance suppression. The POS unit is connected to a workstation at the commissary where inventory is removed for stocking the train to download data relating to the amount of inventory removed from the commissary. The MEMS switch is particularly suited for use in conjunction with both passive and active antenna elements to allow reconfiguration of antenna or other RF structures. A drive signal to be supplied to the liquid droplet jetting head is adjusted based on the wind-velocity information obtained by the wind-velocity sensor.