We've been opening our cars at the push of a button for years, yet resort to plain old metal for our front doors. So why not bring your home up to date and do away with keys? That's exactly the promise of the MyKEY 2300. Once you've installed the MyKEY 2300 keypad on your door (and it can be retrofitted to any door), all you need to do is wave your radiofrequency identification (RFID) tag in front of the keypad, and the door will unlock. The tag itself is built into a small card, and can be put in your wallet, stuck to your phone or attached to your key chain. And if you lose your tag, then just slide up the cover on the keypad and enter your PIN manually. You can then reprogram the MyKEY 2300 with your existing cards, and the lost card will no longer be able to open the lock.