Answer:
Incremental change
Explanation:
An incremental change in business are small changes that are made to already existing structures, and they do not threatennor alter existing methods.
Incremental change is made to add to or sustain value of already existing products, services, and processes.
In this instance Solylin has introduced solar chargers that are compatible with all brands and models of cell phones in the market.
So this is an improvement on traditional chargers and it is an incremental change.