This is the Master Lock 4401LHEC Lock: a Bluetooth padlock that combines with iOS and Android devices to let you easily lock/unlock or monitor access history. You can share temporary or permanent access with others. This lock has a 2-piece weather cover for outdoor protection.
The companion app supports up to 10 locks. This lock is powered by a replaceable CR2 battery. It sends you low battery notification on your phone. Just in case you forget to replace the battery on time, you can use the battery jump function for temporary access.[where to get it]