The battery pack AmazonBasics does its job very well. It invites the connected devices with the specified values and the charge level indicator with 4 LEDs work very reliable. The size of the battery pack is approximately that of a smartphone (5 inch screen). The supplied bag is very convenient and the short supplied cable for charging enough even out. Overall I am very happy with the product. The 10000mAh are perfectly adequate for me if repeatedly charge your smartphone or incidentally still supply the Bluetooth speakers with power, no problem.