PMLN7353A RFID knob

Motorola DP4000/3xx1e series portable radios can be retrofitted with a PMLN7353A RFID knob. This knob allows the radio to be used with RFID readers. Possible applications include:

• Asset allocation: Signing radios in and out of a store room and allocating a specific Radio ID to a user. The User Verification feature in Capacity Max could be a good candidate here.
• Access control: a door can only be opened by holding the radio to the reader.
• Guard Tour Monitoring: to ensure a security guard completes his/her rounds, RFID readers can be placed at various locations.

Guard Tour Monitoring is also possible via Bluetooth 4.0 (if available). There are also a number of Motorola Authorized Application Providers who have tried and tested solutions available.

The RFID tag within the knob complies with ISO/IEC18000 - EPC Class 1 Gen2. The frequency range is 866-868MHz. The tag has a read range of up to 1m.
The tag has a unique pre-pgogrammed EPC (Electronic Product Code) which could be tied to the radios serial number in your database.

My former colleagues from Zebra have readers that will work perfectly here.