Opened once, but brand new and unused. This is a door opening prevention stopper that detects the shaking of an earthquake and locks the door. It prevents stored items such as dishes from flying out. The stopper can be easily released after an earthquake by pushing the door. This product is a set of 2 and is compatible with double doors. (Quoted from HP) I will pack it carefully and ship it. Please feel free to contact me if you have any questions.