Optional Color Temperatures: Three LED color temperatures are available including cool neutral/warm white, ensuring the right choice for your everyday daily situation. Upgraded Performance: Compact and lightweight, powered by two widely available AA batteries. As an upgraded version of i5T, it runs up to 54 hours at 15 lumens and delivers a max output of 550 lumens and a up to 87 meters throw. Stylish Patterns & Colors: Anti-slip double helix knurling ensures you a comfortable grip. Four colors including black, blue, orange, and OD green are offered to you for your personal preference. Smooth Operation: The anti-slip tail switch allows quickly turning the light on/off or shifting modes (15/550 lumens). Easy to Carry: With a two-way pocket clip and lanyard hole, you can easily clip it in a pocket, on a backpack, or hang it around your wrist. Output: 550 lumensRuntime: 54 hoursBeam Distance: 87 meters Battery 2 X 1.5V AA Alkaline Battery (Included) Size 145*17.8mm