Long press the on/off button for 2-3 seconds to adjust the brightness. Press one for 60% brightness. Press again to 30% brightness. Press again to strobe mode. The battery life is up to 3 hours; it will last 1.5 hours of battery life at the highest brightness. The battery indicator light will show red when charging and will turn green when fully charged. It will take 2 hours to be fully charged.
