Disclosed is a lens actuator for focusing. The shaped electrodes utilize its three-dimensional geometry to shape an electric field for electrostatic actuation for MEMS devices. In another embodiment, a measuring or detection system is used in combination with or separate from a ball launcher. Preferential application is in the context of shopping centres, airports, railway stations, stadiums, bus stops, underground train stations, etc. A service component which communicates with the control component has access to the file register and the file definition component. The apparatus has a longitudinally divided tube capable of receiving an optical fiber cable and surrounding free ends of optical fibers of a received optical fiber cable.