This is an adapter that allows for four USB-A ports from a single outlet. It's a product from I-O Data. Note: This is not a battery. Nowadays, you can never have enough USB outlets, right? It's a "TRAVEL ADAPTER" that supports AC100-240V, so you can use it when traveling abroad. Size: 5 x 6 x 3 cm Thank you for looking, and I appreciate your interest. #USBAdapter #USB-A #TravelAdapter #traveladapter #OverseasTravel