Included Are Batteries For The Bright Eyes 2-Pack - Aircraft, Taillight). Super Bright: State of the art CREE Q5 LEDs inside. Adjustable from 80 to a powerful 300 lumens for your safety. Each runs on 3 AAA Batteries. BATTERIES INCLUDED! GoPro Compatible Mounting System: Easily swap out your light and camera on our ultra durable mount. Safety First: Best reliable, incredibly bright bicycle lights for night riding or safety visibility. Buy One, Get One: Mount on 2 bikes, double up on one bike, or give one as a gift. Detach and use as a flashlight. Water Resistant: Ride worry free in any weather conditions, these lights will survive it all. Lifetime Guarantee: Enjoy peace of mind with our lifetime guarantee, ensuring the enduring quality and performance of your light. Proudly USA-Based: Unlike our competition, we are proud to be a USA-based company, committed to delivering quality and reliable products while providing excellent support to our customers across the nation.