1. CalypsoKey and CaseDo you suffer from the problem of forgetting your keys at home. iPhone case maker CalypsoCrystal comes with a contactless door key technology to its range of cases for the iPhone 5, iPhone 4 and iPhone 4S. The iPhone case is equipped with a 13.56 MHz RFID antenna and a 125 kHz RFID antenna inside, which means that your iPhone and you can use this case to lock a NFC door. In addition, no apps are needed for the NFC tech and the case needs no charging. The CalypsoCase Cabrio and CalypsoCase Ring will set you back $129.
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