1.Support 6-8.4V voltage input, flexible adaptation of two series-connected 18650 or 26650 lithium batteries, to ensure that in different battery configurations can work stably, to improve the versatility of the flashlight and endurance capacity 2. Integrated switch in the middle of the flashlight, easy to operate with one hand, whether for outdoor adventure or daily use, you can quickly and easily control the switch to enhance the user experience. 4. Adopting high-efficiency driver chip and optimized circuit design to reduce power consumption and heat generation and enhance the overall performance of the flashlight. 5. Applicable to a variety of flashlight barrel, adapt to a variety of brands and models of lamp beads, for DIY enthusiasts to provide a wide range of upgrading choices Parameter: Input voltage: 6~8.4V (suitable for two 18650 or 26650 batteries in series) Output voltage: 6~7.2V Output current: 1.8~2.3A (suitable for 15~20 watt lamp beads) Gear: three gears (high - low - burst flash) or five gears (high - medium - low - burst flash - S0S) Package include: Flashlight driver board *1