USB car diffuser is our top pick for five reasons. Its primary benefit is that it runs off a car charger, the same kind you’d use to top up your phone. Although it doesn’t come with a cigarette lighter adapter, there is a USB cable in the box, and it should fit any charger you already have.
Second, the body of the diffuser fits neatly into a cup holder. It holds 50mL of water, or enough to keep the diffuser operating up to six hours.
Third, the plastic container is free from BPA, so no toxins leach into the liquid. And when the diffuser runs out of water, it shuts off automatically.
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