Princeton Tec EOS Headlight and Swerve Taillight Bicycle Combination Light Set 1 Maxbright Rebel LED (regulated). 70 Lumen output. three AAA Alkaline batteries (included) with burn times from 50 hours to 1 hour depending on the setting. Includes helmet and handle bar attachments and headband Resistant to water/weather to one meter weight is 105 grams with batteries