Touchscreen Door Lock

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This would have helped the other day when we conveniently locked ourselves out of the house when taking the dog out for a walk. The looks don't hurt either. Made of aluminum and tempered glass, this keypad door lock by Samsung does what a typical combo pad lock does. We do wish the dimensions were smaller than the current 2.70 inches(W) x 6.89 inches(H) x 0.84 inches(D) however. Assuming that power is required to run the screen and display the numbers, what happens when the battery dies?-via Gizmodo