Up for sale is a Chatsworth 16147-054 Proximity Card Reader Module, ELS Electronic Locking System for CPI Cabinets.  It is used surplus property.  The sale includes what's listed in the photos below.  It appears to be used in good condition.  I have no way to test it, but guaranteed to work.  I have other Chatsworth equipment that works together with this that I will be listing separately. 
This does NOT INCLUDE any proximity cards or anything else, just what's shown below in the photos...
 
Contents of sale: 
**** Retail Price:  $2033   ****

I found the information below online:...    
Proximity Card Reader Module (optional )
The Proximity Card Reader Module uses an external card reader and two proximity cards. (NOT INCLUDED with this sale).  Use the proximity cards as user access
keys with the Keypad Module.  (NOT INCLUDED HERE). 
• Two RJ-45 bus-connections for other modules; modules daisy-chain together with RJ-45 patch cords.   (NOT INCLUDED). 
• One antenna connection for an external card reader; NOT INCLUDING an external card reader with a 9’L (2.7 m) attached cord and two
proximity cards; proximity cards provide access to all handles connected to the same module bus as the Proximity Card Reader
Module
• One power connection; includes an auto sensing 100-240 Vac, 50-60 Hz to 12 Vdc, 1.25 A power supply with an IEC 320 C-14
power connector and a detachable 6’L (1.8 m) IEC 320 C-13 to NEMA 5-15P power cord
• Status LEDs: module bus-connection status, module status and power status
• Includes a rack-mount bracket to attach the Proximity Card Reader Module in the space between the equipment mounting rails and the side panel of the cabinet
• DOES NOT INCLUDE installation hardware to attach the external card reader flush to a cabinet door or side panel; locate the external card reader next to the associated Keypad Module
• Proximity Card Reader Module Finish: white metal housing

The Proximity Card Reader Module is an external card reader. Use proximity cards (NOT INCLUDED HERE) as user access keys with a Keypad Module. Two RJ-45 bus-connections for other modules; modules daisy-chain together with RJ-45 patch cords. One antenna connection for an external card reader. Proximity cards (NOT INCLUDED) provide access to all handles connected to the same module bus as the Proximity Card Reader Module. One power connection; includes an auto sensing 100-240 Vac, 50-60 Hz to 12 Vdc, 1.25 A power supply with an IEC 320 C-14 power connector and a detachable 6 (1.8 m) L IEC 320 C-13 to NEMA 5-15P power cord.