The ITEAD PN532 NFC module is based on the PN532 chip for near field communication at 13.56MHz. The module features an on-board antenna and does not require an external antenna coil. It supports SPI, I2C, and UART interfaces for communication. With NFC library support and compatibility with various development platforms, it is easy to integrate into NFC-enabled projects. Effective communication distance: up to 5 cm Supports SPI, I2C, and UART interface switching Enables 13.56 MHz contactless communication Compatible with ISO14443 Type A and Type B standards Chip: NXP PN532 Operating voltage: 3.3V Supply voltage range: 3.3V to 5.5V Maximum supply current: 150mA Standby mode current: 100mA Write mode current: 120mA Read mode current: 120mA Interface: 20-pin standard SPI interface Color: Blue Material: PCB Dimensions: 79 x 48 x 11mm Package includes: 1 x Reader Module Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.