No internet and battery needed
Validated keys always open
What does this mean for your bussiness?

Make as much keys as you want, never worry about abuse or getting payed
Opens locks have wireless keys that you put in your, phone, watch, jewellery.
They have a controllable lifetime!
And can be made available to your customer after he/she pays, instantly

Don't replace batteries
Opens lock require no batteries,
keys work when your phone is not charged
This means you can use them when getting out or in is a security risk!
No need to add wires, just add Opens and it will work for everybody!