Qhov Coob: 2.5×2.5cm Power supply: 4~5V@30mA Work frequency: 125KHz Support chip: TIAB SA 4205, PHA Bioplastics Khoom siv RFID Chip Card, EM4469 or compatible chip (default format Manchester code RF/64) Interface: serial port (TTL-232 format) R/W distance: <7cm Notice: JavaScript yuav tsum muaj rau cov ntsiab lus no.