It is a app to get keys easly and control the door lock device, including the oitsme smart doorman mini SL1 and smart doorman SL2.
The key that the other party can share with you remotely, you can use the ohkey app to get the key and unlock it. The key with permission limits includes a one-time key, a start to end time key and time period key. You can also get a common key to unlock.