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Hi:I iam interested to know more about this product.I am wondering if there is only one card for entering and for power saving use for guest in hotel rooms. Otherwise if one card for entering and the other card for power, the guest can still leave the room keeping one power card inside and continuous to have power on or aircondtion on without anybody in the room for whole day?Please clarify?It is useful for small hotel rooms making sure there is no wasted energy.Looking forward to hear from you soon.Regards,Mercedes *******@*****.com