Several of these readers are available and were only used once for a special event.  Additional details and specifications are available at https://www.parallax.com/product/28340

Overview

The RFID Reader Module USB can be used in a wide variety of hobbyist and commercial applications, including access control, automatic identification, navigation, inventory tracking and payment systems.

There are a variety of transponder tags that come in different packages. Each tag has a specific range that is within 10% of the given distance for each type of tag. The reason for the 10% is due to environmental conditions and RFID modules.

Key Features:

• Low-cost method for reading passive RFID EM4100 family transponder tags
• 2400 baud serial interface through USB virtual COM port
• Enable input allows module to be enabled/disabled by software
• Bi-color LED for visual indication of status
• Easy USB connection to PC
• Powered by USB (no external power required)

Application Ideas:

• Access Control
• Inventory Control
• Navigation

Notes:

• No tags are included with the RFID Reader Module USB.  
• Note: A USB-A to Mini-B cable is required for connection to the PC.
• There are a variety of transponder tags that come in different packages. Each tag has a specific range that is within 10% of the given distance for each type of tag. The reason for the 10% is due to environmental conditions and RFID modules.