"With the familiar "Quick-Click" system users can, within the "General" function set, choose Full Power (643 Lumens); Low Power (148 Lumens); or Eco Mode - Featuring improved recharging efficiency and a super power saving mode that yields up to 66 lumens with greatly extended run-time. As seen below, there are three additional function sets Outdoor; Law Enforcement; and Military each offering a different set of functions invoked in a different sequence, for quickest access to the functions the particular user prefers. The IMPROVED, faster-handling focus system now adjusts from spot to flood with less than 1/4 turn of the head." -Maglite
Official Website; https://www.maglite.com/shop/flashlights/maglite/mag-charger-led-rechargeable-system-904.html
Product Review; "The world famous Maglite flashlights are known for their durability and hefty battery that can go all night. Recently a few modern additions have been made including and much bright LED based bulb, an even more sturdy contruction, and (I believe most importantly) a great rechargeable battery with convenient mountable powering/storage dock. The beam is not incredibly bright, and with the multitude of functions and light settings, it really does feel like the most tried-and-true flashlight just got a highly polished modern update." -MadeInUSAReview