Note: this applies to earlier models of the Capillus cap. Newer models turn off automatically after 6-minutes.
Place the laser dome on your head and simply TAP (do not "hold") the power button to begin treatment. The Capillus laser therapy cap is powered by a rechargeable lithium-ion battery pack. The battery pack is lightweight and easily slips into your pocket, or you can use it with the convenient battery clip and attach it to your belt or waistband.