Hey there fellow Kinksters! Came across this smart lock and hope I'm the first to inform you all - oh my, the possibilities are endless! http://www.ebay.com/itm/NEW-eGeeTou...699413?hash=item3d24296bd5:g:iL4AAOSwi0RXxGgz Here's it in use on me https://chastitymansion.com/forums/...combo-or-key-smartphone-app-controlled.18844/ Works when paired with a smart phone or the included NFC fob -- NO other way to open without cutting through the hasp. Hasp is a tad too thick for my devices, but I suspect you folks can easily think how to remedy that Once locked in - you ain't getting out until that paired phone or fob is tapped onto the lock ! You Keyholders - isn't that the best! As it is unlikely you give out your password to unlock your phone to the wearer there's no access to the app! Of course, in an emergency (when you're not together), the Keyholder "could" give the wearer the password to the created on-line account in order for the wearer's smartphone to be added to the account, then allowing it to be paired to the lock for "extraction". Once the emergency is over, the Keyholder logs into the account, changes the password, deletes the wearers phone, "requires" a picture when the lock is back in it's rightful place Such is the bliss..... That firm makes other similar (and larger) controlled locks --- so let your imagination turn into reality, posting your exploits here of course!