A portable unit worn by a subject, comprising a medical monitoring device, a data processing module with memory and transmitter for collecting, monitoring, and storing the subject’s physiological data and also issuing the subject’s medical alarm conditions via wireless communications network to the appropriate location for expeditious dispatch of assistance. Upper and lower members, in the form of U-shape, are movable along the guide rods between engaging position and separated position. The invention further relates to a wind turbine including at least two pitch controlled wind turbine blades and a pitch controlling mechanism for pitching the blades. The plunger in the syringe barrel is configured to actuate the locking mechanism within the safety needle assembly when the plunger reaches the end of the stroke to the bottom of the barrel. An untrusted host can have a driver directly inserted into it by an administration console, which will facilitate in the collaboration process.