Allow for positioning and safety not possible with standard beds. There are basically three (3) types of hospital beds available for home use: Semi-Electric Beds - allow for raising and lowering the head and the knee break through the use of an automatic hand-held control. Raising the entire bed height is accomplished through use of a manual crank. Manual Beds - allow for raising and lowering the head of the bed and the knee break through the use of a manual crank. Full or half-side rails are available. Full-Electric Beds - allow for the raising and lowering functions of the head and knee break, and the entire bed height adjustment is operated by a hand-held control.