While there may be more than a dozen multi-device wireless chargers technically available now, most do not charge both smart watches and smartphones – and most of the companies who make them could not actually provide units for review since they're bring offered through crowdfunding projects.

As a result, we're limiting this review to multi-device chargers from three stalwart companies and a start-up that promptly shipped over a review unit.

[ Further reading: Wireless charging explained: What is it and how does it work? ]

Zens Dual+Watch Fast Wireless Charger

Dutch electronics vendor Zens recently released a wireless charger that can do what Apple had hoped to do with its AirPower charger before it killed the project.

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