1.Support 5V2A voltage input, flexible adaptation of two series-connected 18650 or 26650 lithium batteries, to 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. 3. Optimized circuit design provides stable current output to maximum brightness of the flashlight, while reducing energy consumption and extending battery life. 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 , adapt to a variety of and models of lamp beads, for DIY enthusiasts to provide a wide range of upgrading choice Charging current:5V2A Discharge current:5V1A LED drive current:3 to 6A Function description: Full brightness - Half brightness - Low brightness - Strobe - SOS Colour:Photo Color Material:PCB Package Contents: 1 x Flashlight driver board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.