Mifare card reader/writer with built-in transceiver antenna; Auto checks for presence of a tag and upload ID need no command   13.56MHz RFID Mifare card Reader/Writer Module ISO 14443 AModel No.:YHY522Specification:l Complete Read/Write module with built-in transceiver antennal Auto checks for presence of tags and output interrupt informationl Auto read/write data from RFID tagl Auto operate value from epursel Easy LOCK/UNLOCK function to protect RFID informationl Encrypted EEPROM to store configured data and up to 40 groups of keysl Contactless operating frequency 13.56 MHzl Supports ISO14443A /MIFARE® ,Mifare® Classic1K,Mifare® Classic 4Kl RS232(TTL) Interface, baud rate up to 230400bpsl Fast data transfer ­Contactless communication up to 106KHzl Secure Encrypted contactless communicationl Ideal for emoney, secure access and fast data collection applicationsl Typical Operating Distance: 0 -- 50 mml Operating Voltage DC 2.7-3.6 Vl Watchdog timerl 1 LED indicator, 3 programmable I/O pinsl Size: 58mm × 35mm × 6mml Weight: 10g