The DC 15V Charger you choose refers to converting the AC input voltage in your home into the DC 15V output voltage required by the device, which means that choosing a suitable DC Charger plays a particularly critical role in whether your device can operate normally. If your current device lacks a DC Charger but you don't know what parameters to choose, experts usually suggest that the first thing you need to determine is the rated voltage and current of the devices that need to be powered (here, the most commonly used 15V is used. LED display screen is an example), we assume that the rated voltage and current of this LED display screen is 15V 3A (the label of general equipment can clearly see this data), then when we choose DC 15V Charger, its current should be 3A, This matches each other.