Features:
5cm max effective range.
SPI pin saving interface.
Independent PCB antenna.
Serve for contactless communication at 13.56MHz.
Support P2P communication.
Support ISO14443 Type A and Type B protocals.

Specifications:
Input Voltage: 5V (3.7-5.5V)
Input Current: 150mA
Typical Current: 100mA
Max. effective range: 5cm
Working mode: P2P， NFC card emulation， card reader/writer
Compatibility: For Arduino UNO， Arduino Duemilanove， Arduino Leonardo， Arduino Mega 2560， Arduino Due， Seeeduino， Seeeduino Lite， Seeeduino Mega.
Packgae size: Approx. 9.7 * 6.8 * 2.7cm / 3.8 * 2.7 * 1.1in
Package weight: Approx. 37g / 1.29oz

Note: Headers of this product is shipped unsoldered.

Interface:

U1: 74VHC125PW IC， Quad Buffer with 3-STATE Outputs.
U2: PN532 IC， Near Field Communication(NFC) Controller.
SPI Interface: Used for Arduino communicates with NFC shield.

Pins usage on Arduino:
D10: SPI chip select
D11: SPI MOSI pin
D12: SPI MISO pin
D13: SPI serial clock pin