Each Card pre-programmed with a unique identification number, printed on the card. The Identification Card is suitable for the 125KHZ Card Reader and the Reading Distance is 0cm to 10cm. Used in Identification, Financial Identification, Access Control Systems, Low Frequency Identification Cards and so on. Read-only, not HID card.

The Module KA2284 is a Battery, Power and Audio Level Indicator.

This is an os card for our RFID readers . The SparkFun L eid RFID Breakout converts the 2mm pins to the breadboard in a friendly 0.1 "headers. With this ability the ID-3LA, ID-12LA, and ID-20LA you can weld the reader directly to the header or use the 2 mm connectors

RF Link Transmissor - 434MHz

We have no idea what USB device you are hooking up to, but if you want to access the microUSB port on something, you might want this.

Stem Shield for your Arduino, the Velleman.