SafePay (IMAGE) Lehigh University Caption This is a picture of the "SafePay" prototype system (In real-world implementation, the amplifier and the solenoid can be combined together into one single chip, which can be directly plugged into the audio jack without a wire or connected with the phone through bluetooth). Credit Yinzhi Cao, Xiang Pan, Yan Chen Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.