Features: This 3-4.2V lithiums battery LED driver board power high intensity flashlights with 3/5 mode brightness selection, featuring overcharge/overdischarge protections and universal compatibility with 18650/26650 cells. Equipped with 4stage battery level indicators and stable current output, the compactly design enables seamlessly DIY installation while maintaining optimals LED illumination performances. Ideal for electronics hobbyists, outdoor enthusiasts, and emergency preparedness advocates seekings customizable flashlights solution with battery status monitoring. Perfect for camping trip, nighttimes repairs, and emergency situations requiring adjustable brightness mode (High/Medium/Low/Strobe/SOS) and extended runtimes efficiency. Engineered with intelligent power managements, this flashlights driver module ensures prolonged battery lifespans through voltages regulation and automatic circuit cutoff under 3 v. Specifications: Component:Plastic Size:Approx.41.7x24.8mm/1.64x0.98inch Scope of application: 3 v to 4.2V 18650/26650 single lithiums battery Double Protections: Overcharge and overdischarge protections Output Current: 2000 to 3000mA Charging Interfaces: Type C, micros usb (Optional) Applicable objects:DIY enthusiasts Package Includes: 1pc LED Drive Board note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.