The Electric Base offers the Custom Keybed a 25" range of heights, available by the push of a button. Hold the up or down button or press one of four pre-selected heights. This base supports up to 300 lbs, so changing heights fully loaded is not a problem! Whether you have shorter and taller users or find different heights more comfortable for different operations, now you can effortlessly change heights in seconds. This version comes with best castors. They roll on carpets and lock effectively on a hard surface floor. And they unlock easily by foot without damaging footwear!