Dallas Readers

 
The i-Button is a rugged memory device containing a uniquely readable "non -repeating" serial number that is the approximate size of a 10 cent coin. Applications include high security access control, simple on and off switching and password authentication.

The system works by touching the i-Button to the reader. A led indicates the status of the reader

Physical
Approx 2cm diameter, can by mounted on a standard switch plate.

Power supply
Operating Voltage: Approx 9 Volts DC
Current Draw: 10mA typical

 
Information from www.ibutton.com

Specifications are subject to change without notice.