When you need the power, versatility, and ruggedness of our Apex headlamp, but your adventures require a lighter weight, you need the Apex Pro. Over 100 grams lighter than our original Apex, the lighter and faster Apex Pro was designed with the unique and ever evolving needs of professional athletes and extreme adventurers in mind. The Apex Pro is powered by 2 CR123 lithium batteries protected in a highly durable and waterproof casing. Built for professionals, perfect for all users.