The M Leg Extensions Motorized Mount 870-1150 HD is an accessory to the M Motorized Mount HD series.When using the M Motorized Mount HD series the need for a strong wall is always there. If you are uncertain of your walls capacity or you have a recognized need of dividing the weight of the screen not only to your wall but also to the floor then the M Leg Extensions Motorized Mount 870-1150 HD is your accessory.Easily attach the leg extensions to the bottom of the M Motorized Mount. Now weight is distributed on the wall and also through its legs to the floor. This makes weaker walls more usable for a wall installation. This product is highly recommended if you use a heavy screen or weak wall. After installation the same smart motorized up and down movement is reached, even with the legs attached. The legs does not interfere with the products movement at all.Always consult a professional prior of installing the M Motorized Mount HD on the wall with or without these leg extensions.