Anti-reflection toughened optical glass lens ,scratch resistant 4 stage battery life display, high temperature protection function Light source: CREE XM-L + 2×CREE XP-G Luminous flux: 1800LM LED lifespan: above 50,000 hours Stepless programming. Choose from 5% to 100% power output using the Command Control Button Lighted Command Control Button with 4 level LED battery level indicator and backlight: Green = 100% charge, Blue = 75% charge, Yellow = 50% charge, Red = 25% charge 250 hour run-time on lowest setting, between 2 and 3 hours on highest setting 2.5 hours run-time on highest setting (conditions vary, run-times vary too) Shell material: 6061-T6 Aluminum alloy Switch: independent switch system Waterproof grade: IP64 Size: ø43×52MM Accessories: charger,2×silicagel mount ring, extension cable Irradiation distance: >800M Working temperature: -10℃40℃ Warranty: light head has 1 year warranty, all other accessories carry 180 days warranty from the manufacturer. MJ-6006 battery pack Specifications: Battery: 4×18650 Li-ion battery (8.4V4.4AH) Battery life: 500 times cycle Charger: DC 8.4V/1.8A Charging time: 3-3.5 hours Sealed in a cylinder hard plastic case Waterproof grade: IP67 Size: diameter 45mm, length 97mm N.W.: 200g plus pouch 30g Comes in a nylon battery bag, with strap to attach to bicycle frame.