v Fully automatic electric hydraulic control system. v The memory device is built-in the elevation function. It can elevate while the memory up/down point automatically. (SG-520 only) v The memory device is built-in the elevation and back section function. It can be moved while the memories up/down point automatically. (SG-510 only) v When the special position is needed, you can touch the foot control switch to adjust the back section up/down; table top up/down; and seat section up/down. (SG-510 & SG-520 & SG-530 only)