... different road situation. DIMMER SLIM HID BALLAST:CHILD LOCK FUNCTION: Key M: When you get your satisfied light level ... the screen will indicate "L" which means the key is locked, then you can free your hand. ... If you want to unlock the key, press key "m" for two seconds, the screen will ... indicate "U" which means key is unlocked.When you press key "+" or "-", the light will change ...