Philips toothbrush travel cases are generally charged via USB. You can follow these steps to charge:
1. First, find the USB port on the travel box.
2. Connect the case to the power adapter using the USB cable provided in the box.
3. Plug the adapter into a wall outlet or USB port on your computer.
4. The plug and\/or indicator light will show the charging status. Under normal circumstances, when the light is on and remains on, it means that the travel box is being charged.
5. After charging is completed, the light will stop blinking or turn off. At this point, the travel box is completely full.
Please note that during charging, do not expose the device to high temperatures or humidity to avoid damaging the device.