The PN532 NFC RFID Reader Writer V3 Module is a highly integrated transmission module for contactless communication at 13.56 MHz including microcontroller functionality based on an 80C51 core with 40 Kbytes of ROM and 1 Kbytes of RAM. The PN532 combines a modulation and demodulation concept completely integrated for different kinds of contactless communication methods and protocols at 13.56 MHz with an easy-to-use firmware for the different supported modes and the required host controller interfaces. It works as RFID reader/writer,1443-A card or a virtual card and also supports NFC with Android phone. It is also compatible with Arduino. Features of PN532 NFC RFID Reader Writer V3 Module: Support II2, SPI and HSU (High-Speed UART) I2C / UART: 3.3V ~ 24V TTL SPI: 3.3V TTL with 100-ohm resistors in series Communication distance: 5cm~7cm On-board level shifter, Standard 5V TTL for I2C and UART, 3.3V TTL SPI Work in NFC Mode or RFID reader/writer Mode RFID reader/writer supports: Plug and play, compatible Built-in PCB Antenna, with 4cm~6cm communication distance On-board level shifter, Standard 5V TTL for I2C and UART, 3.3V TTL SPI Work as an RFID reader/writer Work as a 1443-A card or a virtual card Exchange data with other NFC devices such as a smartphone Package Includes: 1 x PN532 NFC RFID Wireless Module V3 Additional information: Operating Voltage 3.3V ~ 5V Supporting Protocols II2, SPI and HSU (High-Speed UART) I2C / UART: 3.3V ~ 24V TTL SPI: 3.3V TTL with 100-ohm resistors in series Communication distance 5cm~7cm Module Size 42.7 x 40.4 x 4 mm (LxWxH) Shipment Weight 0.1 kg * Product Images are shown for illustrative purposes only and may differ from actual product.