The combination of a headwear piece, an accessory, and a plurality of discrete elements. Typically the rotatable mask comprises a cone. 2 to 2 mLg, a macroporous volume, measured by mercury porosimetry, in the range 0. The alarm system also includes a housing that encloses the alarm module, battery, anti-tamper devices, a transmitter, a receiver, an unauthorized connect sensor, a reefer fault sensor, and a keypad. The gearbox, which may be configured either as a manual or automatic gearbox, utilizes a planetary gear set and a pair of clutches to shift between under drive and direct drive modes.