Roho Hybrid Elite Cushion Single Valve 18 x17 x4.25 Modular Seating 50 60 Hz Output Frequency: 27 Select Ear:Left Ear 50 60 Hz Output Frequency: 27 * Features a padded seat and back complete with drawer storage cabinet * The infinitely adjustable Flip up contoured urethane armrest provides easy access and superior safety for the user * Adjustable height armrest * High impact leveling feet allow the chair to remain level on most surfaces * Fully laminated storage drawer with contoured urethane armrest * Durable powder coated steel frame * New higher 22 Cover with encased comfort foam is machine washable * Combines the suberb skin protection and shape matching ability of ROHO DRY FLOATATION© with the stability of Jay© base technology * This new cushion design allows for improved position and function while maintaining optimal immersion and envelopment of both the ischial tuberosities and greater trochanters * Cushion insert matches the individual s shape by adjusting the amount of air * Air cushion insert is easily cleaned with soap and water