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EU law mandating universal chargers for devices comes into force
(www.france24.com)
This is a most excellent place for technology news and articles.
The chargers l have work just fine. Why do I need to change them?
You don't. But all your new devices from now on will have USB C charging.
To not have to buy and carry around several different cables for your devices
You'll probably need them for old devices. But generally you'll just need a USB A to C cable.
Why does it need to change? The older connectors were too fragile, and needed to be too big of that were to support fast data. USB C can do all of the current data standards and is a pretty robust connector
You may want a newer charger anyway in order to charge faster