Install the Nuki Keypad and you can open your Nuki Smart Lock with a six digit PIN code from now on. The keypad can store up to 100 PIN codes. You can also set temporary codes, so you can let the neighbors in during your vacation to water the plants. And you can let the code expire when you come back home, so you don't have to exchange keys. Is there someone at your door who can't get in and doesn't have a code? In that case, connect the keypad to the bridge and set up a new PIN if you're not at home. This way, your kids won't stand in front of a closed door again. The Nuki Keypad works on batteries, so you won't have to lay cables.