The phrase "productivity device" refers to a tool or gadget that helps people work more efficiently and get tasks done faster. It is something that assists in improving our ability to be productive and accomplish more in less time. Full definition
We've been able to use it for long days out of the office as a lightweight productivity device without the battery being a concern. (pocket-lint.com)
The company wants these new tablets to become capable productivity devices as well as content consumption platforms. (androidcentral.com)
A tablet is meant to be an alternative communications device to the smartphone, and many of us do happen to own a tablet that is a secondary productivity device. (coolest-gadgets.com)