Anyone knows how mobile keys works? On one of my last stay I notice there is key logo on the apps, so I was trying to use it. I never been able to activate the lift and entrance door using the mobile keys. The floor has a door to access as it is a floor with a pool.

I did manage open the room key with the mobile keys but the success rate is not 100% and never on 1st try. My understanding it uses Bluetooth, so technically the phone does not need to be in direct contact with the key reader. Am I correct?