Don’t you hate it when you can’t remember whether or not you looked the front door when you left home? It’s a dreadful feeling that you don’t have to experience anymore, thanks to a cool little accessory called CheckKEY. It’s a sleeve-like accessory that goes over the top part of your regular key and features a small window that indicates whether you locked your door or not. CheckKEY comes with a built-in mechanism that detects when you turn the key clockwise or counterclockwise and changes color accordingly. When you turn the key in the lock clockwise, the little window on the CheckKEY turns white, and when you turn it counterclockwise, it turns orange. The mechanism is entirely mechanical, so you don’t have to worry about batteries. When in doubt, you can just look at your key and tell whether or not you locked your door. The ChecKEY II is available on Amazon for $23.42 and on the Miwa store website, for just ¥1,595 ($10.80). That’s a small price to pay for peace of mind.
