RFID dongles

Would be nice to have a Small RFID dongel that you can use on your keychain to auto open the lock if you do not want to use your smartphone for that kind of stuff… Also with push button ofcourse… just like the ENTR Smartlock has…

It may be possible with the keypad, not with the lock itself for obvious reasons.

Lack of small RFID dongel stops me to buy this device.
Do they plan to be in the future?