2No Key or Combination Necessary Master Lock’s Bluetooth Smart Padlock does only one thing, but it does it very well. When you download the app, your smartphone morphs into an electronic ‘key’ for opening your padlock. The app also allows you to give multiple users access to your lock, thus eliminating the hassle of lost keys and forgotten combinations. You can also create a combination for the lock’s keypad for use when the smartphones aren’t on hand. Plus: These theft-prevention ideas are inexpensive and effective.
