Buka'aj: 2.5×2.5cm Power supply: 2.7~5V@30mA Work frequency: 125KHz Support chip: ATA5557, T5567, T5577 or compatible chip (default format Manchester code RF/32) Interfaz: puerto serie (TTL-232 format) Nachil ti' xooka' Cancún: <7Cm, write distance: <6Cm (T5557, T5567, T5577 Chip R/W Module has read-only and read-write two models, according to the project needs to choose the right module.)