Inaccurate voltage rating. The 10V listed by default is the minimum input (I'd recommend at least 12), so a 9V battery won't help. Otherwise it works as stated. Addendum: Very sensitive to noise. A well-tuned boost converter will drive it with no problem, but noisier power supplies, including laptop power supplies, are useless. When there are noise issues, it appears to be an instantaneous turn on (perhaps for half a second) followed by an instantaneous turn off that can be repeated.
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