Specifications CordLock LED Light .25oz - 7.5gms Ultimate Backpacking LightWeight Accessory Three Light Settings: High - 12 hrs Low- 20 hrs Flash- 50 hrs (Usefull map reading or backpack sorting light levels about half these times. Ok for many camp chores. It won't replace you main hiking light, but it's a very very convenient backup and mini task light that does double duty as a cordlock so it's always handy.) • Water Resistant • Corrosion proof stainless steel sordlock spring. • Two Lithium CR1220 batteries - Comes with two lithium batteries- Ready to Go! • 3mm Hyperbright LED, 12,000mcd • Easy battery change Useful On: • Stuff sacks • Backpacks • Sleeping Bags • Anywhere you use a standard cordlock! What's a regular cordlock weigh? About 3gms. - So these are only 5gms or only about .2oz more!