The three functions are showed in the picture The first function is head rise and down(0-80) The second function is foot rise and down(0-35) The third function is HI/LO for the whole bed frame(distance between bed frame andfloor lowest250-highest550mm) The three functions are showed in the picture 12.5CM Castors 2 With Brakes,Voltage:220/110V, 3 Motors(remote)Accessories wheels Aluminum alloy protective railing