A cushion, preferable of a buoyant material, includes a layer of threat-resistant material for precluding penetration by a projectile from a firearm or sharp edged or sharp pointed instrument and serves in the manner of a shield to prevent injury to a person’s shielded body parts. The water penetration resistant material helps the delay the onset of swelling of the clay and polymer until it reaches the formations intended for sealing. The second baseband processing module converts non-real-time outbound data into non-real-time outbound symbols and converts non-real-time inbound symbols into non-real-time inbound data. The concentration of the charge transport compound in the charge transport layer decreases from the lower surface to the upper surface. Preferably, the controlling lever is formed with a stop or protrusion at the lower edge thereof for self-keeping in the braked position for parking the wheeled walker.