A Belkin 10,000 mAh power bank is a portable battery designed for on-the-go charging, featuring a 10,000 mAh battery capacity for multiple device charges. It offers fast charging capabilities, often with a 20W output, and can charge multiple devices simultaneously, with specific models including a built-in USB-C cable or a combination of USB-A and USB-C ports. The power bank includes LED indicator lights to show its own battery status and is available in various colors, such as black or blue.