There are plenty of fake Apple products out there, including chargers that could damage your device. Phys.org provides some things to look out for.

One of the biggest selling points for counterfeits is their cheap price as an alternative to Apple’s accessories. Good news: There are plenty of legitimate options outside of Apple made by third parties…When in doubt, look out for those “Made for iPhone” or “MFi certified” labels and descriptions to make sure what you’re buying will work as expected.

ZDNet recently did some interesting research. Adrian Kingsley-Hughes wanted to know how much it would cost in electricity to charge an iPhone 6 Plus for a year. He chose this model because it has the biggest capacity battery Apple offers in an iPhone. The result will shock you (pun intended).

On average, during an overnight charge, the iPhone consumed an average of 19.2 Wh. According to figures published by the US Energy Information Administration for January 2016, the average cost per kWh in the US was $0.12. Remember that 1 kWh equals 1,000 Wh. So, take our average of 19.2 Wh per day, multiplying that by 365 days, we get 7 kWh, which works out at $0.84 a year. So if you guess under a dollar, well done.

That’s right, it costs less than a dollar for an entire year. The more you know!