Buy bad products
Many roadside stalls, or the street shop, selling the charger prices are below $10, when use normally charged into electricity, but without any logo, even the most basic brand name all have no, but a lot of people the charger is broken, or if you want to keep a charger in the office, because the price cheap, buy this charger.
You can buy one didn't know any product information of the charger is bought home a ticking time bomb. The charger in order to save the finished product, the internal circuit is very simple, without any protection mechanism, when the charging voltage is not stable, the inside of the device is easy to breakdown short-circuit current, and because there is no short circuit protection, a carelessly exploded.
If you buy this kind of charger, without any product information carefully you can see the charging phone will appear when the splash screen, screen, leakage or jump reflect slower, for their own safety, suggest don't use any more.