Answer:
"integrate their technology into devices"
Explanation:
This is the article “Cutting the Cords: How Wireless Charging Will Keep Toxic Waste Out Of Landfills” by Brian Clarke Howard. It basically claims that batteries, even rechargable, pose a great environmental threat and suggest an alternative; a wireless charging of electrical devices.
One of the ways is retrofitting our devices. Now, this word may seen strange to many, so let us try to find its meaning from the context.
The example is given, that the cellphones could be charged wirelessly through cellphone cases embedded with induction coils.
However, it would be wrong to assume that retrofitting means embedding something with induction coils. That is only an example for this particular wireless charging case. In a broader sence, retrofitting means using new technologies to make an older object compatible with new devices; sort of upgrading it.
With that in mind, we can conclude that the best fitting phrase would be "integrate their technology into devices"
