4 positions can be taken with one button operation. 1. "Sleeping position" - The position where you can take a good rest from the bed's original "sleeping" posture. 2. "Reclining position" - A position where you can take a relaxed posture by adjusting your favorite angle by raising your back and legs. 3. "Sitting position" - A position where even if it is difficult to take a sitting position with the soles on the floor, a stable sitting posture can be achieved. 4. "Standing position" - Position that supports rising and transferring with the lift-up function.