There are a few Bluetooth / app enabled padlocks on the market today, but this one caught my eye for actually looking like a normal padlock. It’s a big hunk of steel, with just a small LED indicator on the front. But instead of requiring a key or dial spin, it can be unlocked via a smartphone or through a tap pattern on the shackle.
You can give one-time or permanent access to others via the app, which makes it pretty useful for securing your dead drops from enemy spies.
The Noke Padlock is a Bluetooth enabled smart lock that unlocks with your iOS or Android phone to get rid of the need for keys and combinations.