Specification: Wattage: 10W.  Waterproof: IPX7.  Waterproof: Yes.  Usage: Working/Hiking/Camping/Running/Night Fishing.  Switch Mode: High/Middle/Low.  Model of LED Beads: XPL.  Light Source: LED Bulbs.  Lifespan: 50,000 hours.  LED Emitting Color: 5300K/4000K/3000K.  Item Type: Headlamps.  Feature3: elastic headband.  Feature2: with magnetic tail cap.  Feature1: USB Direct Charger.  Dimension: 108mm (L)*25mm (head diameter).  Beam Angle: 180°.  Battery Type: LITHIUM ION.  Battery: 18650 or 18350 rechargeable.  SP40is Sofirn's first headlight.  It designed for home, EDC or outdoor activities like camping, hiking etc.  It hasmagnet tail cup,and it can be adsorbed on many iron object to bring more convenience in using process.  It can be operated from a single18650Li-ion rechargeable battery.  Or be operated from a18350battery by use the repalce Battery host.  Aerospace grade 6061 grade aluminum alloy, CNC manufactured to Military Grade Specification type Ⅲ hard-anodized anti-abrasive finish to get solid built body, anti-crash geometry and better heat exchange.  SofirnSP40usesCREE XPL LEDwith a lifespan of50,000hours.  Working Voltage:2.8V-4.2V.  Battery Options: One18650Li-ion battery.  Dimension:108mm (length)*25mm (head diameter).  Weight:63±1gram (without batteries).  Toughened mineral glass lens.  The waterproof level: in accordance withIPX7.  Reverse polarity protection from improper battery installation.  Mode Memory : Last mode remembered  - It memorizes the last brightness level used in the general modes (except Strobe).  USB input:5V1A.     Operation Instruction: The switch controls all flashlight functions as follows: Short clickto turn on,another clickto turn off.  While the light is on, the side switch to cycle through modes:Low→Mid→High.  Double clicksto activate Turbo mode,one clickto return last mode.  Advanced Temperature Regulation (ATR) technology:ATR will adjust the brightness level automatically when the driver temperature reaches 55℃ to prevent overheating.  Power Indicator:The LED indicator on side switch blinks in green for 5 seconds if remaining battery power is over 30%. When the indicator turns to red, battery juice is below 30%. Flashing red light indicates low power - replace or recharge battery ASAP.     Package Included: Option 1.without battery: 1headlamp;1clip;1 USB cable,2replace O-rings;1 18350battery tube.     Option 2.with battery: 1headlamp;1clip;1 USB cable,2replace O-rings;1 18350battery tube;1 3000mah 18650battery