Press the swicth to low brightness adjustment, third gear adjustable brightness, 1st 100% brightnees, 50% brightness 2 files, 3 levels of 25% brightness.
Press the 4th of strobe, according 5th SOS flashing, 6th to power off.
The built-in rechargeable lithium battery, different stalls countinuous different power up for 8-20 hours.
Computer USB or powered mobile phone charger (5V 1A)
Charge the battery 2 to 4 hours can be filed.