The revolutionary coupling system of MVP502 offers both the user and carer ultimate comfort when reclined. The innovated anti - sliding design and the V-shaped seat can effectively distribute pressure to reduce the risk of pressure sores. Carefree Design - Often the sliding of of the user is a problem and can be very dangerous for both the user and carer. Many carers end up with bad backs from having to repeatedly adjust the position for the user when they have slid down the seat. Now the innovated coupling system effectively reduces the sliding and bedsores, giving them the true peace of mind. Coupling designed armrest - Our arm has to shift backwards for ease when upper body reclines. Therefore to place the arm right, a structural enhancement is really required. As the result, the armrest is thoroughly improved for exceptional user safe.