Rechargeable, Saving Your MoneyThe headlight comes with 2*18650 high capacity rechargeable lithium batteries and 1 USB cable. You can charge this LED headlamp with the included USB cable and don?t have change batteries frequently, saving your money and good for environment.For better, brighter and longer-time lighting, you should put two batteries when using, even though single battery is also workable.The headlamp can work up to 4-9 hours if fully charged. The battery lasting time depends on the brightness of the LED lamp.The charging indicator (near the charging port) will illuminate red during charging. Once fully charged, the charging indicator will change to green. Note: It may take between 4.5 to 5 hours to fully charge the headlampMain Light Source:First press: Turn on the middle main lights (high beam).Second press: Turn on the main lights on both sides (low beam).Third press: Turn on all main lights.Four press: All main lights are flashing (SOS strobe).Ultra Bright & PortableWith 5 high-brightness LEDs, this LED rechargeable headlight illuminates brighter and longer. Portable and suitable for camping, caving, hiking, climbing, mountaineering, fishing, hunting, car repairing, exploring, IDY works or emergency situations.Waterproof & High QualityWith waterproof design with IPX4 rating, the rechargeable head light can work normally even in rainy days. The high-quality materials make it last longer and can withstand various conditions.Adjustable & ComfortableThe lamp head can be rotated flexibly by 90 degrees, making the bright light to reach different angles and ranges. The high-quality adjustable elastic strap is easy and comfortable to wear and remove, not sliding, suitable for both adults