Use your smartphone to open this padlock from Master Lock. Share access, monitor access history and receive alerts if someone is tampering. Designed for outdoor use, its shackle offers 2 inch vertical clearance and is made of boron for maximum resistance to cutting and sawing. The lock features alternate methods of access for when Bluetooth isn’t available or the replaceable battery dies. Its typical list price of $89 has been reduced 34% to $59 (see on Amazon). An indoor version is available, also at a discount (28% off, $50 — See on Amazon).

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Source: Security