Prima - adheres to the USB wiring specifications. One can even Nokia smartphones vis USB Micro connection charge - and the very fast even with 1.400er batteries !! This charger holds just like Nokia in the USB ports on the smartphone thank God totally to the Specifications !!
Double Charger USB as the Hama USB Charger 5V / 2.1A (V2) here on Amazon not - so you can not Nokia smartphones load due to incorrect internal wiring this Hama-charging device.