FEATURES-Machined aircraft-grade aluminum with black anodized finish-5mm white LED, impervious to shock with a 100,000 hour lifetime-10 lumens typical, parabolic shaped LED area optimizes beam performance-Rotating On/Off head switch-Up to 8 hours declining useable output-Runs on (4)IEC-LR41 coin cells-Non-rotating snap hook-1.47" long-0.36 oz.