The "4safe" designation means that the charger is equipped with four protection mechanisms that protect both the charger itself and the connected device. These protections include overvoltage protection, which prevents damage to the phone in case the grid voltage fluctuates and an excessively high value reaches the device. Furthermore, there is overload and short-circuit protection. This ensures that the charger automatically shuts off if, for example, a cable failure or an internal problem in the phone occurs that could cause a dangerous surge in current. The final component is overheating protection. The charger monitors its own temperature and, should it start to overheat, reduces its power output or deactivates completely to prevent damage.