I CODE 2/SLI Key Card is one type of Hotel Key Card, it's Consists of the chip, the sensor antenna,it's Packaged in a standard PVC, ABS, PET material card, No exposed parts of the card.the I CODE 2/SLI Hotel Key Card  Reading and writing process, ibetween coupled resonant circuit with the reader via radio waves or contact contact

To complete the read and write operations. the I CODE 2/SLI Hotel Key Card is a non-powered,When the reader read and write to the card reader signals superimposed on the composition consists of two parts: one part is a power signal, the signal received by the card, rather than their own L / C resonance, producing an instant energy tosupply chips work. The other part is a combination of data signals, the command chip to complete the modification of data, storage and return it to the reader, to complete a read or write operation. The data on the card can save more than 10 years long,it's use to Shopping malls, hotels, clubs, cinemas, bars, beauty salons, video games, etc...