Abstract: A digital data transfer between two users' electronic devices such as cell phones, smartphones, tablet PCs, laptops, etc., is initiated by detecting both that the users' wrist-worn electronic data exchange units have been brought into proximity, and also that their on-board accelerometers sense movement consistent with a gesture, especially that two equipped users are shaking hands. The electronic data exchange units can communicate over a limited distance and can use Bluetooth. The data transfer can be arranged to be automatic without the attention of the users. The data transfer order is determined in part according to differences in the wait time for the two users' electronic devices to communicate with the respective data exchange units. The exchanged data can include user contact information to be stored via a smartphone application in a database.

Abstract: A digital data transfer between two users' electronic devices such as cell phones, smartphones, tablet PCs, laptops, etc., is initiated by detecting both that the users' wrist-worn electronic data exchange units have been brought into proximity, and also that their on-board accelerometers sense movement consistent with a gesture, especially that two equipped users are shaking hands. The electronic data exchange units can communicate over a limited distance and can use Bluetooth. The data transfer can be arranged to be automatic without the attention of the users. The data transfer order is determined in part according to differences in the wait time for the two users' electronic devices to communicate with the respective data exchange units. The exchanged data can include user contact information to be stored via a smartphone application in a database.