If the cylinder battery is flat, it can be opened or closed using the Masterkey or an active key. If the key does not have a battery (= user key), the locking authorisations can be transferred to an active key for 20 seconds or the Masterkey for a few seconds. This key is used to transmit contactless signals and energy to the cylinder, thus allowing the door to be opened if an access authorisation is available.

For a clear allocation of the keys in the app, a Winkhaus UID is engraved on the tip of the active keys. This Winkhaus UID consists of the logo 4HOME and a six-digit number.
Example: 4HOME112773
 

An active key can be used both actively and passively. The active key does not need to be activated with the button for passive operation.

The active key has a power supply.  It has a button for activating the battery and an LED indicator. The following functions distinguish it from the user key:
- Operate cylinder with empty battery
- Read out data from passive key to operate cylinder with empty battery (external power function)
- Masterkey function 
- Assign remote authorisation

If the Masterkey is lost and found again or if a Masterkey was initialised incorrectly, it can be reset to the factory settings. Following the reset, the former Masterkey can be added to the system as an active key.