Finnish company Valkee sells the HumanCharger, a pair of $150 earbuds with integrated LEDs to shine light into your ears. Their claim:
This revolutionary device is for your well-being and channels bright light directly to the light-sensitive regions of the brain, right where it is needed the most.
HumanCharger® can be used to increase energy levels, improve mood, increase mental alertness, reduce the effects of jet lag and keep winter blues at bay.
A site called Valkee's Earlight Swindle International argues otherwise.