Weighs less than half an ounce and has 3 light levels plus a blink mode that will flash for 45 hours. To conserve battery, it automatically turns off after 6 minutes in high, medium, or low modes. Weather-resistant. 1 meter impact resistance tested. 10 lumens. Size: 1.8″ x 1.2″ x .37″. Weight: .37 ounces.