The Fenix E05R Keychain Flashlight delivers impressive 400 lumen performance in an ultra-compact design that's perfect for everyday carry. Measuring less than 3 inches long and weighing only 0.85 ounces this mini powerhouse features a rechargeable 320mAh Li-polymer battery with convenient micro-USB charging.Fenix E05R 400 Lumen Keychain FlashlightFour brightness levels plus Instant Burst mode for maximum outputBuilt-in rechargeable 320mAh Li-polymer batteryHidden micro-USB charging port accessed by unscrewing headDurable A6061-T6 aluminum construction with anodized black finishImpact resistant dustproof and waterproof designUltra-compact: less than 3" long 1" diameter 0.85 oz weightPerfect for keys pocket or purse carry this reliable mini flashlight is built tough for any situation and provides dependable illumination for all your everyday needs.