I installed one of these nifty gadgets. The USB plug is capable of 2.4A, a tad less than you're asking about.
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After you install the wheel sensors, it will
also give you pressure from each individual tire, which the Clarity does not give.
The Clarity just tells you when one of the tires is low, but doesn't indicate which one is low. A pretty stupid Marketing decision, if you ask me.
There are a couple forum participants that have installed these, and unless things have changed, we're all pretty happy with them.