1. Support ISO18092, ISO14443A, ISO14443B, ISO15693, FeliCa and other protocols2.<br> Using differential antenna design, the output can reach 1.4W, and the sensing distance is .-in<br> low- capacitive sensor, supports induction and capacitive wake-up, and can sense the presence of a card without turning on the magnetic field of the card reader.3.<br> The onboard STM32F103RBT6 controller is convenient for direct learning and evaluation or development and integration, no need to other main control boards4.<br> Onboard 1.3-inch OLED screen, convenient for users to operate visually.<br> Onboard SRAM memory chip, no afraid of insufficient internal RAM.<br> Onboard -SD card slot, external TF card can be used to store NFC data to be transmitted.5.<br> There are four buttons and two user indicators on the board, which is convenient for users to debug.<br> Onboard download interface, serial port debugging interface, and lead out the unoccupied IO port, which is convenient for users to other devices.<br> Matching customized acrylic shell, one more layer of protection, beautiful and dust-proof.<br> complete supporting manuals and sample programs[My parameters]:NFC chip: ST25R3911BWorking frequency band: 13.56MHzOutput : 1.4W (max)Communication interface: SPIsupporting agreement:ISO18092 (NFCIP-1) P2PISO14443A, ISO14443B and FeliCaISO15693Other standard and custom protocols (such as Classic)Supply voltage: 5VWorking voltage: 3.3VProduct size: 105.5 x 66 x 17.6mmMaterial: PCBcolour: bluePackage Contents:1 x ST25R3911B NFC development boardOnly the above package content, other products are not included.Note:<br> Light and different displays may the color of the item in the a little different from the real thing.<br> The measurement allowed error is +/- 1-3cm.