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Pulling the plug out is a small thing, while sometimes it may be trouble!
PRESS BACK is a plug which is easy to out-stretch and pull-back. By applying the spring device as the traditional ball-point pen, the front-pins are safely covered in the case when unused, and by directly pressing the back-button, the pins will show out and ready to insert into the socket.
The most brand-new value of the PRESS BACK is that it replaces the way of extracting the plug only by simply pressing the back. Thus, the users can just use one finger to extract the plug on the extension cord. What’s more, the pins will be safely kept inside the case simultaneously.


National Cheng Kung University

National Cheng Kung University
Tainan, Taiwan

Chia-yi Chien,
National Cheng Kung University

Si-ping Lin,
National Cheng Kung University

Yu-hao Shen,
National Chiao Tung University