Buy a shiny new padlock and hold in your hand something that hasn’t changed much since the Romans used them 500 years before Christ. The ubiquitous lock has a u-shaped shackle that connects to a body containing a mechanism that locks and unlocks with a key or combination wheel.
Keys get lost and combination codes forgotten so the company Dog & Bone put its own stamp on the padlock, or actually, your stamp, by creating a smart lock that is controlled by an app on your smartphone.