In their simplest form, they have non-adjustable height of 80cm, adjustable backrest from (0 - 60o) and Trendelenburg (0 - 10o). Leg section is removable and can be manually positioned horizontally as an extension of the bedding surface. All adjustments are assisted by dedicated gas spring mechanisms. ? The more advanced models have adjustable height (70 - 90cm) adjustable backrest from (0 - 80o) and Trendelenburg (0 - 15o). Leg section is removable and can be manually positioned horizontally as an extension of the bedding surface. All adjustments are achieved electrically via hand-held control.