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Proximity card by radiofrequency.
It allows automatic user identification by radio frequency RFID.
Passive card contains a chip that to be approached from a reader receives an induced current that triggers it.
When triggered returns an identification code for the system does not require any battery.
Communication with the reader low frequency 125 KHz.
Made of PVC, similar in shape and size to a credit card, being very easy to store and carry.
Maximum safety, not copyable device.
Also compatible with CHUANGO alarms