USB powered chargers

 

— the ability to power the charger from a standard USB port. This gives quite extensive connectivity options: most modern computers and laptops are equipped with similar ports, they are also found in other electronics, and even USB adapters are available for sockets (both conventional and car). At the same time, many gadgets with USB (for example, laptops) are self-powered, which provides even more convenience. On the other hand, in some situations (an outdated version of USB, connection via a hub), the power supply on the connector may not be enough for efficient operation of the charger.