Fangrui Product Details 1. Support 6-8.4v Voltage Input, Flexibly Adapt To Two 18650 Or 26650 Lithium Batteries In Series, Ensure Stable Operation Under Different Battery Configurations, And Improve The Versatility And Endurance Of The Flashlight. 2. The Integrated Switch In The Middle Of The Flashlight Is Convenient For One-handed Operation. Whether It Is Outdoor Adventure Or Daily Use, The Switch Can Be Controlled Quickly And Easily To Improve The User Experience. 3. Optimize The Circuit Design To Provide Stable Current Output To Ensure The Maximum Brightness Of The Flashlight, While Reducing Energy Consumption And Extending Battery Life. 4. Adopt High-efficiency Driver Chip, Optimize Circuit Design, Reduce Power Consumption And Heat, And Improve The Overall Performance Of The Flashlight. 5. Suitable For A Variety Of High-intensity Flashlight Bodies, Adapt To A Variety Of Brands And Models Of Lamp Beads, Providing A Wide Range Of Upgrade Options For Diy Enthusiasts. Input Voltage: 6-8.4v (suitable For Two 18650 Or 26650 Batt