The retail giant has faced lawsuits in both Europe and the US claiming it is not doing enough to prevent the spread of COVID-19 in its warehouses.
One US union accused the firm of profiting from the pandemic while leaving its workers unprotected.
Amazon said it had invested billions in COVID-19 initiatives.
The firm is now testing a wearable device that alerts workers when they are violating social distancing rules, according to CNBC, which obtained a memo about the technology.
