1. Support 6-8.4V voltage input, flexibly adapt to two 18650 or 26650 lithium batteries in series, 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 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 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 batteries in series,No batteries included, you need to prepare them yourself) Output voltage: 6-7.2V Output current: 1.8-2.3A (suitable for 15-20W lamp beads) Gear: three gears (high-low-strobe) or five gears (high-medium-low-strobe-SOS) Due to different batches, there may be differences in product appearance and printed text, which not affect use Specification:B:Micro-USB Interface Colour:Green Material:PCB Package Contents: 1 x Dual lithium 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.