Really annoying, don’t use it.

• As soon as you press ‘A', it’s enabled

• To reset, just pull the power and reconnect

• Press down till it reaches the lowest height

• Release

• Press and hold down till ‘RST’ (looks more like ‘AS-upside down L’)

To unlock it, hold the down button till it pops up again and the ‘RST’ disappears, to be replaced by a number

• Move to desired height

• Press 'M', you will see 'S - ' on the display

• Press the number to commit to memory