The device looks just like a high-tech brush. It plugs in via a USB cable and takes about four hours to fully charge, then lasts for 60 minutes on a single charge (about 12 five-minute sessions). The brush has just one button to turn it on and off, and with the button, you also toggle through the three modes: Gentle, Balance, and Boost. There isn’t a ton of information about the different settings, but each one increased the overall intensity of the vibrations, which are felt through the small, rounded metal nib bristles that vibrate the scalp in short, buzzy intervals. These bristles are short, hard, and don’t move, so be careful, because…
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