Product Features *Manual insert RF card read/ write *Programmable dual-colors LED bezel *HID USB interface or RS232 interface *Transparent body design *Customization Service *Dual-color LED functions: RED LEDï¼Bright when the card is inserted into machine Green LED : Bright when No card is inserted into machine or standup status . *5V power supply *Comply with ISO1443-3/-4 standard with frequency of 13.56MHz ess IC card (TYPE A, TYPE B, CPU card);Mifare 1K series S50/S70/UL card read/write. *CE certificate