The HPASOS system has been specifically designed to meet the needs of  unpressurised airframes flying at altitudes in excess of 10,000ft providing the  pilots and aircrew with protection against the effects of hypoxia.

It is the most efficient and easy to use system available, not batteries required.

The Oronasal Mask Assembly has been designed in conjunction with the POD  Unit, again as a key component of the HPASOS system. The mask comes with a  fully integrated communications suite allowing voice communications over the  existing aircraft network. The mask also benefits from a fully adjustable helmet  interface which allows the user to quickly and easily drop the mask off the face  when the aircraft is flying at an altitude where oxygen is not required, below  10,000ft.

The Pneumatic Oxygen Delivery Unit is one of the key components of the  Helicopter Pilot and Aircrew Supplementary Oxygen System (HPASOS). The  system has been designed specifically for the pilots and aircrew of unpressurised  rotary wing aircraft, giving them protection against the effects of hypoxia when  flying at altitudes in excess of 10,000ft.