A collapsible wheelbarrow includes a rigid front bracket, a wheel rotatably secured to the front bracket, and first and second handle arms pivotably attached to the front bracket. An oxygen module according to the present disclosure generally comprises an oxygen source, a mask and a tube between the oxygen source and a mask. The component is configured to operate according to an internal setting. The network has a defined network time frame, and each device maintains and adjusts its own clock and relationship with the network time.