Pro-Ject Accu Box S2 USBAccu Box S2 USB is an accu driven power supply that delivers perfectly transmissioned power to any 5V input product. The big advantage being that the power supply is then separated from the polluted mains. No disturbing interference can be passed on to the unit this way, resulting in a more clear and spacious sound signature. The 2600 mAh capacity will give many hours of listening pleasure. In contrast to regular power banks, Accu Box S2 USB uses Li