In March 2019, the FDA cleared a pair of headphones called Cervella which promises to treat depression, anxiety and insomnia. What's the science behind this and other cranial electrotherapy stimulation devices and do they work?

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Sources:
Shekelle PG, Cook IA, Miake-Lye IM, Booth MS, Beroes JM, Mak S. Benefits and Harms of Cranial Electrical Stimulation for Chronic Painful Conditions, Depression, Anxiety, and Insomnia: A Systematic Review. Ann Intern Med. ;168:414–421. doi: 10.7326/M17-1970 (https://annals.org/aim/article-abstract/2672602/benefits-harms-cranial-electrical-stimulation-chronic-painful-conditions-depression-anxiety?doi=10.7326%2fM17-1970)

Feusner JD, Madsen S, Moody TD, et al. Effects of cranial electrotherapy stimulation on resting state brain activity. Brain Behav. 2012;2(3):211–220. doi:10.1002/brb3.45
(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3381625/)