This system uses the transponder technique, which means that the exchange of data between the badge and the reader is carried out via a magnetic field (without physical contact). The reader is also equipped with a keypad, allowing conventional use of the device.
Keypad: 3x4 keys
Dimensions: 5.1" x 3.4" x 1.0"
Maximum reading range from 5.5"-7.9" (under normal environment)