The one-hour design series was inspired by the painful experience of plugging in the dark one day.

By adding inclined planes to the plug and socket, the user is guided to use it in a dim environment (or for the visually impaired). Although there are more steps, the position will not be found for half a day. At the same time, since there is no need to touch the jack for positioning, there is no need to touch the metal insert during operation, which can ensure safety.