size 1 means US Charger size 2 means EU Charger1. Made of high quality aluminum alloy， this flashlight is sturdy and durable enough for long time daily using.2. Excellent waterproof， suitable for outdoor environment， adverse weather conditions.3. Emitter Type: CREE4. Material: Outer casing is aluminum alloy; Handle is plastic5. Bulb Quantity: 16. LED Lifespan: 100，000 hours7. Modes: 3 (High， Low， Strobe)8. Mode Arrangement: High > Low >Strobe9. Lighting Distance: 300-500 m10. Battery Configuration: 2 x 1865011. Input Voltage: 3.6-4.2V，4.2V max12. Runtime: 3-6 hours13. Switch Type: Clicky14. Color: BlackPackage Included:1 x Flashlight1 x AC Charger1 x Car Charger2 x 18650 Battery