12. A panic button in Apartment Intercom
We've already discussed how doorbells have built-in cameras in Japanese flats, but what would it help when you feel like you're in danger? Luckily, you can find a special button on the right corner of the intercom that will immediately alert the security. If you sense danger and was trying to avoid making too much noise, it will come in handy. Furthermore, if you lock yourself inside and someone tries to get in, the system will also be triggered.
