With Sandberg Outdoor Powerbank 10400 mAh in your luggage, you will never again have an empty battery on your phone or mobile device when there is no charging socket nearby. A commercially available smartphone can be charged up to 4 times. The robust and waterproof packaging ensures that it is ready for use everywhere. You can charge up to two devices simultaneously, such as a smartphone and a tablet. The indicator lights at the top indicate the battery charge level.